Introduction
The coronavirus disease-2019 (COVID-19) pandemic has caused widespread social, health, and economic challenges. Pandemic-related stressors including risk of virus exposure which could lead to severe illness or death, social distancing, and lockdown measures may negatively impact mental health, which has led to calls for research on the population-level mental health effects of COVID-19 (Holmes et al., Reference Holmes, O'Connor, Perry, Tracey, Wessely, Arseneault and Bullmore2020). These impacts might be especially pronounced in the United States, which has suffered the highest number of confirmed COVID-19 cases and deaths in the world (Dong, Du, & Gardner, Reference Dong, Du and Gardner2020), as well as an economic recession that has persisted into 2021. Indeed, repeated cross-sectional surveys of nationally representative samples of American adults have found high prevalence of psychiatric distress during the pandemic – with roughly a quarter of respondents (v. 6.5–8.1% in 2019) reporting symptoms of anxiety and depression in one survey (Czeisler et al., Reference Czeisler, Lane, Petrosky, Wiley, Christensen, Njai and Rajaratnam2020) and 13.6% (v. 3.9% in 2018) reporting serious psychological distress in another (McGinty, Presskreischer, Han, & Barry, Reference McGinty, Presskreischer, Han and Barry2020b) – raising concerns that the prevalence of psychiatric disorders such as major depressive disorder (MDD), generalized anxiety disorder (GAD), and posttraumatic stress disorder (PTSD) may have increased.
Despite these findings, only a few longitudinal studies to date have examined changes in psychiatric distress in the U.S. population during the pandemic (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021; Daly & Robinson, Reference Daly and Robinson2020; McGinty, Presskreischer, Anderson, Han, & Barry, Reference McGinty, Presskreischer, Anderson, Han and Barry2020a), and several of these studies did not assess pre-pandemic distress (Daly & Robinson, Reference Daly and Robinson2020; McGinty et al., Reference McGinty, Presskreischer, Anderson, Han and Barry2020a). This is an important gap, as repeated cross-sectional surveys rely on measurements from different samples, often using different methodologies. Longitudinal assessments of the same cohort over time are needed to understand whether mental health has worsened for individuals relative to their own pre-pandemic mental health. To our knowledge, only one previous longitudinal study has measured pre-to-peri-pandemic change in psychiatric distress in a nationally representative sample of U.S. adults (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021). This study found that a similar proportion of the sample reported past-month serious psychological distress on the Kessler-6 (Kessler et al., Reference Kessler, Barker, Colpe, Epstein, Gfroerer, Hiripi and Zaslavsky2003) in May 2020 as reported past-year serious distress in February 2019 (10.9% v. 10.2%). Although past-month estimates were not directly compared, the authors interpreted this similarity as an increase in distress based on a previous finding from a nationally representative study that the past-year estimate of serious distress was approximately double the past-month estimate (Hedden et al., Reference Hedden, Gfroerer, Barker, Smith, Pemberton, Saavedra and Novak2012). Additional methodologically rigorous longitudinal studies of Americans, particularly in vulnerable subpopulations (Holmes et al., Reference Holmes, O'Connor, Perry, Tracey, Wessely, Arseneault and Bullmore2020), are needed to better understand the mental health burden of the COVID-19 public health crisis. In addition, information about factors associated with pandemic-related psychiatric distress in these vulnerable groups is essential to identifying individuals most in need of support, and to inform targeted clinical and policy interventions.
One subpopulation of the United States that may be uniquely vulnerable to psychiatric distress during the pandemic is military veterans. Veterans have greater exposure to childhood adversity and combat trauma (Katon et al., Reference Katon, Lehavot, Simpson, Williams, Barnett, Grossbard and Reiber2015), which are known to sensitize individuals to the negative effects of later stressors (Bandoli et al., Reference Bandoli, Campbell-Sills, Kessler, Heeringa, Nock, Rosellini and Stein2017; Nichter, Hill, Norman, Haller, & Pietrzak, Reference Nichter, Hill, Norman, Haller and Pietrzak2020a; Smid et al., Reference Smid, van Zuiden, Geuze, Kavelaars, Heijnen and Vermetten2015). In addition, veterans are more likely to have a history of psychiatric conditions, such as PTSD, suicidal behavior, and substance use disorders relative to the non-veteran population (Hoggatt, Lehavot, Krenek, Schweizer, & Simpson, Reference Hoggatt, Lehavot, Krenek, Schweizer and Simpson2017; Lehavot, Katon, Chen, Fortney, & Simpson, Reference Lehavot, Katon, Chen, Fortney and Simpson2018; United States Department of Veterans Affairs Office of Mental Health & Suicide Prevention, 2019), which may be exacerbated by pandemic stressors (Murphy, Williamson, Baumann, Busuttil, & Fear, Reference Murphy, Williamson, Baumann, Busuttil and Fear2020). Indeed, one previous study of veterans with pre-existing psychiatric disorders found that pre-pandemic psychiatric symptom severity predicted suicide ideation during the pandemic (Na et al., Reference Na, Tsai, Hill, Nichter, Norman, Southwick and Pietrzak2021). Finally, relative to civilians, veterans have higher rates of medical morbidities such as cardiovascular disease, obesity, and diabetes (Hoerster et al., Reference Hoerster, Lehavot, Simpson, McFall, Reiber and Nelson2012; Lehavot, Hoerster, Nelson, Jakupcak, & Simpson, Reference Lehavot, Hoerster, Nelson, Jakupcak and Simpson2012), which may increase vulnerability to health-related stressors including risk of severe disease from COVID-19 infection and pandemic-related delays in obtaining routine health care (Földi et al., Reference Földi, Farkas, Kiss, Zádori, Váncsa, Szakó and Szentesi2020; Ssentongo, Ssentongo, Heilbrunn, Ba, & Chinchilli, Reference Ssentongo, Ssentongo, Heilbrunn, Ba and Chinchilli2020). Despite these characteristics no known study has examined pandemic-related changes in the mental health of the general U.S. veteran population.
To address this gap, we analyzed data from a nationally representative sample of U.S. military veterans who completed surveys before and nearly 1 year into the pandemic. To identify changes in specific disorders, we first measured the pre- and peri-pandemic prevalence of positive screens for common psychiatric conditions; then, following prior research (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021), we used a continuous, transdiagnostic measure of psychiatric distress to assess variability in distress more sensitively and identify correlates of increased distress. We had three aims: (1) to examine changes in the prevalence of positive screens for MDD, GAD, and PTSD from pre-to-peri-pandemic; (2) to identify pre-pandemic risk and protective factors that predicted a clinically meaningful increase [i.e. 0.5 standard deviation (s.d.) or higher; Norman, Sloan, and Wyrwich, Reference Norman, Sloan and Wyrwich2003; Ready et al., Reference Ready, Thomas, Worley, Backscheider, Harvey, Baltzell and Rothbaum2008; Schnurr et al., Reference Schnurr, Friedman, Foy, Shea, Hsieh, Lavori and Bernardy2003] in psychiatric distress (i.e. continuously assessed composite score of MDD, GAD, and PTSD symptoms); and (3) to evaluate associations between COVID-19-related infection stressors, general pandemic stressors, and pandemic-related changes in risk factors, and increased psychiatric distress.
With respect to aim 1, we hypothesized small but significant pre-to-peri-pandemic increases in positive screens for psychiatric disorders, based on general population findings (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021) and greater pre-pandemic mental health problems among veterans (Hoglund & Schwartz, Reference Hoglund and Schwartz2014). With respect to aim 2, we hypothesized that pre-pandemic factors that robustly predict psychiatric distress, such as prior trauma exposure, psychiatric and substance use problems, and loneliness (Bandoli et al., Reference Bandoli, Campbell-Sills, Kessler, Heeringa, Nock, Rosellini and Stein2017; Kuwert, Knaevelsrud, & Pietrzak, Reference Kuwert, Knaevelsrud and Pietrzak2014; Seal et al., Reference Seal, Cohen, Waldrop, Cohen, Maguen and Ren2011; Smid et al., Reference Smid, van Zuiden, Geuze, Kavelaars, Heijnen and Vermetten2015), would positively predict increased distress during the pandemic, whereas psychological and social characteristics previously shown to protect mental health would negatively predict distress (Pietrzak & Cook, Reference Pietrzak and Cook2013). With respect to aim 3, we hypothesized that COVID-19 infection stressors, general pandemic stressors, and increases in pre-pandemic risk factors would be associated with increased psychiatric distress (Birditt, Turkelson, Fingerman, Polenick, & Oya, Reference Birditt, Turkelson, Fingerman, Polenick and Oya2021; Holingue et al., Reference Holingue, Badillo-Goicoechea, Riehm, Veldhuis, Thrul, Johnson and Kalb2020; Holman, Thompson, Garfin, & Silver, Reference Holman, Thompson, Garfin and Silver2020; McGinty et al., Reference McGinty, Presskreischer, Anderson, Han and Barry2020a; Shi et al., Reference Shi, Lu, Que, Huang, Liu, Ran and Lu2020; Wang, Kala, & Jafar, Reference Wang, Kala and Jafar2020; Zheng et al., Reference Zheng, Morstead, Sin, Klaiber, Umberson, Kamble and DeLongis2021).
Methods
Participants
Data were analyzed from two waves (hereafter: pre-pandemic and peri-pandemic) of the 2019–2020 National Health and Resilience in Veterans Study (NHRVS), which surveyed a nationally representative sample of 4069 U.S. military veterans. Pre-pandemic data collection began before the first documented case of COVID-19 infection in China and ended before implementation of the first COVID-19-related lockdown in the USA (median completion date: 21 November 2019). Peri-pandemic data were collected from 3078 veterans (75.6% of the original sample) approximately 1 year later, during the 2020 fall and winter surge of COVID-19 cases (median completion date: 14 November 2020). Recruitment and sample details of the 2019–2020 NHRVS have been reported previously (Hill, Nichter, Loflin, Norman, & Pietrzak, Reference Hill, Nichter, Loflin, Norman and Pietrzak2021). Briefly, the sample was drawn from KnowledgePanel®, a survey research panel of more than 50 000 households maintained by Ipsos. Ipsos statisticians computed post-stratification weights to permit generalizability of results to the U.S. veteran population using benchmark distributions from the Veterans Supplement of the most contemporaneous U.S. Census Current Population Survey (Bureau of the Census, 2019). All participants provided informed consent. The study was approved by the Human Subjects Committee of the VA Connecticut Healthcare System and carried out in accordance with the Declaration of Helsinki.
The sample consisted of veterans aged 22–99 years (mean age = 63.2; s.d. = 14.7). The sample was mostly male (91.6%); 79.3% were non-Hispanic Caucasian, 10.3% non-Hispanic African American, 6.0% Hispanic, and 4.4% mixed/other race. The sample included veterans who had served in all branches of the U.S. military [majority Army (47.3%), Navy (20.8%), or Air Force (18.9%)], 35.0% were combat veterans, 79.6% reported having enlisted in the military, and 20.1% reported utilizing VA as their primary source of healthcare.
Assessments
At the pre-pandemic assessment, sociodemographic and military characteristics, psychosocial risk and protective factors, and current psychiatric conditions were assessed. At the peri-pandemic assessment, psychosocial factors and psychiatric conditions were reassessed using the same measures, and COVID-19 infection stressors (related to actual infection of the self or close others) and pandemic stressors (related to general pandemic stressors such as risk of disease, social distancing, and lockdowns) were assessed. Table 1 presents detailed descriptions of all the measures used to assess mental health outcomes, as well as all predictors and correlates that were examined in relation to changes in psychiatric distress.
Table 1. Measures of psychiatric, sociodemographic, military, and psychosocial variables and COVID-19 infection and pandemic stressors
COVID-19, coronavirus disease-2019; VA, veterans affairs; DSM-5, Diagnostic and Statistical Manual of Mental Disorders, 5th edition; MDD, major depressive disorder; GAD, generalized anxiety disorder; PTSD, posttraumatic stress disorder; AUD, alcohol use disorder; DUD, drug use disorder; UCLA, University of California, Los Angeles.
Data analysis
Statistical analyses were performed using SPSS version 25 and R statistical software. Raw unweighted frequencies are reported. Missing data (<3%) were multiply imputed using chained equations. When computing prevalence and inferential statistics, post-stratification sampling weights were applied to allow for generalizability to the entire population of U.S. military veterans (Ipsos, 2020).
Data analyses proceeded in six stages. First, descriptive statistics were computed to estimate the prevalence of positive screens for MDD, GAD, and PTSD at pre-pandemic and 1-year peri-pandemic, and McNemar's tests were computed to evaluate differences between prevalence estimates at each wave. Second, using standardized z scores of a composite measure of psychiatric distress (i.e. increased MDD, GAD, or PTSD symptoms), change in distress from the pre- to peri-pandemic assessment was computed (z scoreperi-pandemic − z scorepre-pandemic), and then the sample was divided into veterans who did and did not experience a clinically meaningful increase in distress over this period using a minimum increase in distress of 0.5 s.d.. This threshold was selected based on evidence that a change of at least 0.5 s.d. represents a minimally clinically important difference for a broad range of measures, including psychiatric symptoms (Norman et al., Reference Norman, Sloan and Wyrwich2003; Ready et al., Reference Ready, Thomas, Worley, Backscheider, Harvey, Baltzell and Rothbaum2008; Schnurr et al., Reference Schnurr, Friedman, Foy, Shea, Hsieh, Lavori and Bernardy2003). To further validate this threshold in the current sample, rates of mental health treatment initiation during the pandemic were compared between veterans with and without increased psychiatric distress. Third, independent samples’ t tests for continuous variables and chi-squares for categorical variables were conducted to compare veterans with and without increased psychiatric distress with respect to sociodemographic and military characteristics, psychosocial risk and protective factors, pre-to-peri-pandemic changes in psychosocial risk factors, and COVID-19 infection and pandemic stressors. Fourth, a hierarchical logistic regression analysis was conducted to examine pre-pandemic predictors and peri-pandemic correlates of increased psychiatric distress. Variables that were statistically significantly associated with increased distress in bivariate analyses (p < 0.05) were entered as independent variables in this analysis. Step 1 included pre-pandemic sociodemographic, military, and psychosocial risk factors; step 2 included pre-pandemic psychosocial protective factors; and step 3 included pre-to-peri-pandemic changes in risk factors and COVID-19 infection and pandemic stressors. Fifth, a series of planned post-hoc analyses were conducted to identify individual variables comprising pre- (e.g. social connectedness) and peri- (e.g. COVID-19-related disease worries) pandemic composite measures independently associated with increased psychiatric distress. Sixth, a relative importance analysis (Tonidandel & LeBreton, Reference Tonidandel and LeBreton2011) was conducted using the R statistical package relaimpo (R Core Team, 2019) to determine the relative contribution of each significant variable identified in the hierarchical regression model and planned post-hoc analyses. This analysis partitioned the explained variance in increased psychiatric distress that was attributable to each significant independent variable while accounting for intercorrelations among these variables.
Results
Table 2 presents the pre- and peri-pandemic prevalence estimates for MDD, GAD, and PTSD positive screens in the full sample and by age group. There was a statistically significant increase in the estimated prevalence of GAD from pre- to peri-pandemic in the full sample (7.1% to 9.4%), which was driven by an increase in GAD positive screens in veterans aged 45–64 years (8.2% to 13.5%).
Table 2. Pre-pandemic to 1-year peri-pandemic prevalence of positive screens for MDD, GAD, and PTSD among U.S. military veterans
MDD, major depressive disorder; GAD, generalized anxiety disorder; PTSD, posttraumatic stress disorder.
Statistically significant p values (p < 0.05) are bolded.
A total of 389 (weighted 13.2%) veterans scored 0.5 s.d. or higher on a composite measure of change in psychiatric distress at the 1-year peri-pandemic assessment (mean change in distress = 1.1 s.d., s.d. = 0.6). Supporting the clinical validity of the 0.5 s.d. cut-off, veterans who met or exceeded this threshold were significantly more likely than those who did not to initiate mental health treatment during the pandemic (8.3% v. 3.4%, χ2 = 17.29, p < 0.001), and nearly 60% of these veterans screened positive for peri-pandemic MDD, GAD, and/or PTSD
Table 3 presents bivariate comparisons of veterans with and without increased psychiatric distress on measures of sociodemographic and military characteristics, pre-pandemic psychosocial risk and protective factors, pre-to-peri-pandemic changes in risk factors, and COVID-19-related infection and pandemic stressors. Compared with veterans who did not experience an increase in distress (mean change in distress = −0.20, s.d. = 0.5), veterans who did were younger and more likely to have enlisted into the military. They were also more likely to report several pre-pandemic risk factors, including more adverse childhood experiences, lifetime diagnosis of MDD and/or PTSD, lifetime diagnosis of alcohol use disorder and/or drug use disorder, and greater severity of past-year alcohol problems, frequency of past-year non-prescription drug use, and loneliness. They also scored lower on pre-pandemic measures of protective psychosocial characteristics and social connectedness and were more likely to report increases in loneliness and alcohol-related problems during the pandemic. In addition, they were more likely to endorse exposure to a range of infection and pandemic stressors, including knowing someone infected with COVID-19 and experiencing COVID-19-related disease worries, social restriction stress, socioeconomic stress, and relationship difficulties.
Table 3. Characteristics of U.S. military veterans with and without increased psychological distress from pre- to peri-pandemic
s.d., standard deviation; VA, veterans affairs; MDD, major depressive disorder; PTSD, posttraumatic stress disorder; AUD, alcohol use disorder; DUD, drug use disorder; COVID-19, coronavirus disease 2019.
Increase in alcohol problems and increase in non-prescription drug use are binary variables; veterans with alcohol use problems or non-prescription drug use that increased by 0.5 s.d. or more from pre-pandemic to peri-pandemic were coded positive for respective increases in alcohol problems and drug use. Statistically significant p values (p < 0.05) are bolded.
Table 4 presents results of a hierarchical logistic regression analysis examining independent pre-pandemic predictors and COVID-19-related correlates of increased psychiatric distress. In step 1 of the model (pre-pandemic risk factors), fewer adverse childhood experiences and greater severity of past-year alcohol problems and loneliness predicted increased psychiatric distress. In step 2 of the model (pre-pandemic protective factors), veterans with higher levels of social connectedness were less likely to experience increased distress. In step 3 of the model (COVID-19-related changes and stressors), veterans with greater increases in loneliness and higher levels of COVID-19-related disease worries, social restriction and socioeconomic stress, and relationship difficulties were significantly more likely to experience increased psychiatric distress.
Table 4. Results of hierarchical logistic regression analysis of predictors and correlates of increased psychological distress
AOR, adjusted odds ratio; CI, confidence interval; MDD, major depressive disorder; PTSD, posttraumatic stress disorder; AUD, alcohol use disorder; DUD, drug use disorder; COVID-19, coronavirus disease-2019.
Statistically significant p values (p < 0.05) are bolded.
Results of planned post-hoc analyses revealed that veterans with a secure attachment style [Wald χ2 = 8.02, p = 0.005; odds ratio (OR) 0.65, 95% confidence interval (CI) 0.48–0.87] and larger social network (Wald χ2 = 3.99, p = 0.046; OR 0.98, 95% CI 0.96–0.99) pre-pandemic were significantly less likely to experience increased psychiatric distress 1 year into the pandemic. With regard to pandemic-related items, increased psychiatric distress was associated with greater concern about the stability of one's living situation (Wald χ2 = 36.64, p < 0.001; OR 1.67, 95% CI 1.42–1.98), worries about COVID-19 affecting one's mental health (Wald χ2 = 11.90, p = 0.001; OR 1.24, 95% CI 1.10–1.40), stress related to changes in social contacts (Wald χ2 = 11.22, p = 0.001; OR 1.31, 95% CI 1.12–1.53), worsening quality of one's relationships with friends (Wald χ2 = 6.68, p = 0.010; OR 1.30, 95% CI 1.06–1.58), and worries about COVID-19 infecting friends or family (Wald χ2 = 6.49, p = 0.011; OR 1.18, 95% CI 1.04–1.35).
As shown in Fig. 1, a relative importance analysis revealed that social network size [12.2% relative variance explained (RVE)] and loneliness (11.7% RVE) were the strongest pre-pandemic predictors of increased psychiatric distress. Stress related to changes in social contacts during the pandemic (15.8% RVE), worry about effects of the pandemic on one's mental health (15.3% RVE), and increased loneliness during the pandemic (13.6% RVE) were the strongest peri-pandemic correlates of this outcome.
Fig. 1. Results of relative importance analysis of significant correlates of increased psychological distress from pre- to peri-pandemic.
Note. COVID-19=coronavirus disease 2019; Error bars represent 95% confidence intervals. Adverse childhood experiences (0.8% relative variance explained) and pre-pandemic alcohol use severity (2.8% relative variance explained) were not significant predictors of increased psychiatric distress in the relative importance analysis (both p's>0.05).
Discussion
To our knowledge, this is the first study to examine pandemic-related mental health changes in a nationally representative sample of U.S. military veterans. The current findings suggest that veterans evidenced considerable mental health resilience during the COVID-19 pandemic, but with substantial heterogeneity in individual vulnerability. Consistent with our first hypothesis, we found a pre-to-peri-pandemic increase in positive screens for GAD. This increase translates into substantial negative impact when extrapolated to the national population of nearly 18 million veterans (Vespa, Reference Vespa2020); using estimated population benchmarks (Bureau of the Census, 2019), more than 400 000 additional veterans may have screened positive for GAD 1-year into the pandemic. Elevated GAD was driven largely by veterans aged 45–64 years, among whom GAD positive screens increased by more than 65% from pre-to-peri pandemic (8.2% to 13.5%). This result was somewhat surprising given previous findings of greater pandemic-related distress among young adults (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021; Czeisler et al., Reference Czeisler, Lane, Petrosky, Wiley, Christensen, Njai and Rajaratnam2020; Holman et al., Reference Holman, Thompson, Garfin and Silver2020; McGinty et al., Reference McGinty, Presskreischer, Han and Barry2020b). However, data from previous studies came from early in the pandemic, and there is some evidence that age differences in psychiatric distress decreased over time (Banks, Fancourt, & Xu, Reference Banks, Fancourt, Xu, Helliwell, Layard, Sachs, De Neve, Aknin and Wang2021). Our results suggest that middle-aged veterans may have experienced unique challenges as the pandemic progressed, such as overlapping stressors related to the health and economic impacts of the pandemic. Indeed, post-hoc comparisons of the three age groups revealed that middle-aged veterans reported higher levels of COVID-19-related disease worries than younger veterans, and greater COVID-19-related socioeconomic stress than older veterans. As middle-aged individuals typically are not yet retired but are also of an age associated with more severe health impacts of COVID-19 (Fang et al., Reference Fang, Li, Yu, Wang, Zhang, Chen and Ma2020), this group may have found it difficult to continuously self-isolate due to work-related responsibilities, and stressful to attend in-person work due to heightened disease risk. Moreover, this age cohort often balances work and care-taking responsibilities (Hopps, Iadeluca, McDonald, & Makinson, Reference Hopps, Iadeluca, McDonald and Makinson2017), and they may have been disproportionately impacted by persistent school closures and remote learning (Garbe, Ogurlu, Logan, & Cook, Reference Garbe, Ogurlu, Logan and Cook2020).
Although this increased anxiety is consistent with elevated distress observed in cross-sectional surveys (Czeisler et al., Reference Czeisler, Lane, Petrosky, Wiley, Christensen, Njai and Rajaratnam2020; Holman et al., Reference Holman, Thompson, Garfin and Silver2020; McGinty et al., Reference McGinty, Presskreischer, Han and Barry2020b), the increase was smaller in the current study, and we observed notable stability in the prevalence of MDD and PTSD positive screens. This may be because the current study assessed the same cohort pre- and peri-pandemic, which is essential to accurately assessing pandemic-related changes over time. Indeed, our findings are consistent with a developing literature of longitudinal studies showing only small within-subject, population-level changes in mental health outcomes during the COVID-19 pandemic. For example, a recent rapid-review and meta-analysis of 25 longitudinal and natural experiment studies consisting of more than 70 000 participants from around the globe found small effects of COVID-19 lockdowns on anxiety (g = 0.17) and depression (g = 0.15), and null effects on general distress, positive functioning, and suicide risk (Prati & Mancini, Reference Prati and Mancini2021). Similarly, roughly 75% of respondents in the only previous U.S. population-based longitudinal study reported low psychiatric distress at both pre- and peri-pandemic assessments (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021). The current study extends this literature by demonstrating a similar pattern among U.S. military veterans, a population that has been characterized as high-risk for mental health impacts of the COVID-19 pandemic (Amsalem et al., Reference Amsalem, Lazarov, Markowitz, Gorman, Dixon and Neria2021).
Despite considerable resilience, however, pandemic-related mental health changes among veterans were heterogeneous, mirroring research showing wide individual variability in responses to acute stress (Bonanno & Mancini, Reference Bonanno and Mancini2012). In fact, when we examined within-person changes in transdiagnostic symptoms of MDD, GAD, and PTSD, nearly 1 in 7 veterans experienced more than a 0.5 s.d. increase in distress relative to their pre-pandemic levels. This estimated 13.2% of veterans with increased distress is strikingly similar to the 12.8% of U.S. adults who reported increased distress from pre- to peri-pandemic in a previous longitudinal study (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021). As this increase was not fully accounted for by the increased prevalence of positive GAD screens, it appears that a significant proportion of the distress that emerged during the pandemic was sub-diagnostic. However, the magnitude of this increase suggests a need for intervention to prevent increased distress from transitioning into more persistent psychiatric disorders. Thus, these findings highlight the importance of delineating risk factors for pandemic-related psychiatric distress to target interventions to vulnerable veterans.
Results of a relative importance analysis revealed that pre-pandemic social factors – specifically, social network size, loneliness, and attachment style – predicted increased psychiatric distress during the pandemic. Specifically, veterans with a larger pre-pandemic social network size and secure attachment style were less likely to experience an increase in distress, whereas veterans with greater pre-pandemic loneliness were more likely to experience such an increase. Collectively, pre-pandemic social factors accounted for roughly a third of the explained variance in increased distress. These findings, which are consistent with a literature showing that social support may help buffer the deleterious effects of stressors through psychobiological mechanisms (Ditzen & Heinrichs, Reference Ditzen and Heinrichs2014), align with calls for health care providers to regularly monitor social factors in populations at increased risk for pandemic-related distress (Killgore, Cloonan, Taylor, Lucas, & Dailey, Reference Killgore, Cloonan, Taylor, Lucas and Dailey2020). Brief, validated measures such as the Three-Item Loneliness Scale (Hughes, Waite, Hawkley, & Cacioppo, Reference Hughes, Waite, Hawkley and Cacioppo2004) could be used to screen veterans in primary and mental health care settings.
Results of a relative importance analysis also identified potentially modifiable pandemic-related stressors associated with increased psychiatric distress, including social losses – stress about changes in social contacts, increased loneliness, and worsening in the quality of friend relationships – worry about effects of the pandemic on mental health, and concern about housing stability during the pandemic. These findings support our third hypothesis and have several practical implications. First, associations of social loss with increased distress highlight the importance of prevention efforts such as outreach and messaging campaigns to share strategies for virtual social connection and to destigmatize loneliness. Second, associations of distress with worry about pandemic effects on mental health underscore the need for public investment to reduce barriers to mental health care. As telehealth delivery is as effective as in-person delivery of evidence-based anxiety, depression, and PTSD treatments (Morland et al., Reference Morland, Wells, Glassman, Greene, Hoffman and Rosen2020; Tuerk, Keller, & Acierno, Reference Tuerk, Keller and Acierno2018), expansion of these services is warranted. Resources to provide smart tablets, as successfully piloted by the Department of Veterans Affairs (Zulman et al., Reference Zulman, Wong, Slightam, Gregory, Jacobs, Kimerling and Heyworth2019), could expand access to low-income households where smart phone and laptop ownership are not universal (Nadkarni et al., Reference Nadkarni, Hasler, AhnAllen, Amonoo, Green, Levy-Carrick and Mittal2020). Brief video interventions that boost treatment-seeking intentions may also be helpful (Amsalem et al., Reference Amsalem, Lazarov, Markowitz, Gorman, Dixon and Neria2021), as many veterans even with severe psychological symptoms are not engaged in treatment (Nichter, Hill, Norman, Haller, & Pietrzak, Reference Nichter, Hill, Norman, Haller and Pietrzak2020b).
Third, associations of distress with housing stability concerns highlight the need for continued government financial support for vulnerable individuals – perhaps particularly for middle-aged veterans. The high levels of financial stress and disease worries reported by this age cohort suggest greater fears of job instability and virus exposure, which may happen in work settings. This distress may signal a need for extension of unemployment insurance and direct payments introduced early in the pandemic to offset the impact of persistent job losses and concerns about the safety of returning to work. To abate housing concerns, expansion of housing-specific interventions such as rental and mortgage assistance and eviction diversion programs may be beneficial (Benfer et al., Reference Benfer, Vlahov, Long, Walker-Wells, Pottenger, Gonsalves and Keene2021). For veterans specifically, this relief may come from the recent allocation of additional funding to the Housing and Urban Development-Veterans Affairs Supportive Housing program (HUD-VASH), which provides rental assistance and housing vouchers to veterans at risk of homelessness. Our findings support the expansion of this program's priorities during the pandemic to include a greater focus on homelessness prevention, which could include direct renter payments to veterans accumulating significant debt that may result in homelessness when eviction moratoria are lifted.
The current study has important strengths, including the use of a large, nationally representative sample of veterans, a pre-to-peri-pandemic longitudinal design, and assessment of the prevalence of psychiatric conditions in late 2020, after pandemic-related mental health effects had additional time to unfold. However, results must also be interpreted in the context of several limitations. First, the sample consisted of predominantly older, white, and male U.S. military veterans; distress might be higher among individuals underrepresented in the veteran population. As previous research has found greater pandemic-related distress among women (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021), ethnic/racial minorities (McGinty et al., Reference McGinty, Presskreischer, Han and Barry2020b), and young adults (Breslau et al., Reference Breslau, Finucane, Locker, Baird, Roth and Collins2021; McGinty et al., Reference McGinty, Presskreischer, Han and Barry2020b), the current results may not generalize to civilians or veterans in these groups, or to veterans who are institutionalized or homeless. Second, although retention was relatively high (75.6%), veterans with a pre-pandemic diagnosis of MDD, GAD, and/or PTSD were less likely to complete the follow-up survey than veterans without these diagnoses (67.4% v. 76.7%). Therefore, it is possible that the prevalence of these disorders may have been underestimated due to retention or survivorship bias (Czeisler, Wiley, Czeisler, Rajaratnam, & Howard, Reference Czeisler, Wiley, Czeisler, Rajaratnam and Howard2021). Third, although we assessed peri-pandemic stress later in the pandemic than previous studies, mental health effects of the pandemic may be delayed and manifest over time, as economic, health, and social consequences of the pandemic compound. Fourth, screening instruments were used to assess psychiatric symptoms; studies using clinical interviews are needed to confirm the prevalence estimates reported in this study. In addition, we selected a 0.5 s.d. cut-off to indicate increased psychiatric distress, which, although identified in previous research as a valid indicator of clinical distress (e.g. Norman et al., Reference Norman, Sloan and Wyrwich2003) and significantly associated with mental health treatment-seeking in the current sample, may or may not indicate a transition to a clinically concerning level of symptoms; indeed, some studies have used higher thresholds to define adverse mental health outcomes (e.g. top 10% of the distribution of change scores; Chen and Hardy, Reference Chen and Hardy2009). However, we note that the group created using this cut-off experienced, on average, greater than a standard deviation increase in distress (mean change in distress = 1.1 s.d., s.d. = 0.6); in fact, the prevalence of positive screens for MDD, GAD, and/or PTSD in this group increased from 9.4% at pre-pandemic to 54.2% at peri-pandemic. Although it is possible that some of the increased distress we observed, particularly lower magnitude increases, reflected normal fluctuations in symptoms, we posit that even sub-diagnostic increases in distress are important to identify as they may portend more substantial problems. Fifth, COVID-19-related correlates of increased psychiatric distress were measured simultaneously with peri-pandemic distress, making the temporal direction of these associations unclear; it is possible that increased mental health symptoms caused veterans to report greater perceived stress related to the pandemic.
Conclusions
These limitations notwithstanding, the current study provides the first known nationally representative data on the mental health impact of the COVID-19 pandemic on U.S. military veterans. Our findings, which align with the broader literature showing high rates of adaptive functioning in the face of trauma, adversity, and disaster (Bonanno, Reference Bonanno2005; Norris, Tracy, & Galea, Reference Norris, Tracy and Galea2009; North et al., Reference North, Tivis, McMillen, Pfefferbaum, Spitznagel, Cox and Smith2002), reflect the remarkable human ability to adapt even to profound disruptions to daily life wrought by the pandemic. However, they also highlight disparities in the effects of the pandemic and the resultant need for targeted interventions to protect those at risk of deteriorating mental health, particularly middle-aged veterans and veterans with low social connectedness.
To better understand trajectories of risk and resilience, it will be important to continue tracking long-term changes in mental health, ideally using continuous measures of psychopathology, which are more sensitive to detecting within-person changes in distress. Because of the ongoing nature of the pandemic and the continued presence of imminent stressors, it is unclear whether the elevated distress we observed will result in durable and functionally impairing psychiatric disorders. Prior research has found that population-level increases in distress following natural disasters often return to pre-disaster levels over time (Pietrzak et al., Reference Pietrzak, Tracy, Galea, Kilpatrick, Ruggiero, Hamblen and Norris2012). Although still early, emerging evidence about the persistence of distress during the pandemic in the USA is mixed; one study found an early spike in distress in spring of 2020 that returned to baseline levels by summer (Daly & Robinson, Reference Daly and Robinson2020), but another study found consistent high distress in April and July (McGinty et al., Reference McGinty, Presskreischer, Anderson, Han and Barry2020a). Because data from the current study were collected in the fall of 2020, the elevated distress we observed may be an indicator of more persistent mental health problems. Post-pandemic follow-up will be essential to understanding the prevalence and determinants of acute v. long-term changes in mental health and functioning in veterans and the population at large.
Acknowledgements
The authors thank the veterans who participated in this study.
Financial support
The National Health and Resilience in Veterans Study is supported by the U.S. Department of Veterans Affairs National Center for Posttraumatic Stress Disorder.
Conflict of interest
The authors MH, BN, SN, LM, and RP have no conflicts of interest to declare. JK is a scientific advisor to Biohaven Pharmaceuticals, BioXcel Therapeutics, Inc., Cadent Therapeutics (Clinical Advisory Board), PsychoGenics, Inc., Stanley Center for Psychiatric research at the Broad Institute of MIT and Harvard, Lohocla Research Corporation. JK owns stock and/or stock options in Biohaven Pharmaceuticals, Sage Pharmaceuticals, Spring Care, Inc., BlackThorn Therapeutics, Inc., Terran Biosciences, Inc. JK reports income <$10 000 per year from: AstraZeneca Pharmaceuticals, Biogen, Idec, MA, Biomedisyn Corporation, Bionomics, Limited (Australia), Boehringer Ingelheim International, Concert Pharmaceuticals, Inc., Epiodyne, Inc., Heptares Therapeutics, Limited (UK), Janssen Research & Development, L.E.K. Consulting, Otsuka America Pharmaceutical, Inc., Perception Neuroscience Holdings, Inc. Spring Care, Inc., Sunovion Pharmaceuticals, Inc., Takeda Industries, Taisho Pharmaceutical Co., Ltd. JK reports income >$10 000 per year from Biological Psychiatry (Editor). JK received the drug, Saracatinib from AstraZeneca and Mavoglurant from Novartis for research related to NIAAA grant ‘Center for Translational Neuroscience of Alcoholism’ (CTNA-4) from AstraZeneca Pharmaceuticals. JK holds the following patents: (1) Seibyl JP, Krystal JH, Charney DS. Dopamine and noradrenergic reuptake inhibitors in treatment of schizophrenia. US Patent no. 5447948. 5 September 1995; (2) Vladimir, Coric, Krystal, John H, Sanacora, Gerard – Glutamate Modulating Agents in the Treatment of Mental Disorders US Patent No. 8778979 B2; Patent Issue Date: 15 July 2014. US Patent Application No. 15/695164: Filing Date: 5 September 2017; (3) Charney D, Krystal JH, Manji H, Matthew S, Zarate C, Intranasal Administration of Ketamine to Treat Depression United States Application No. 14/197767 filed on 5 March 2014; United States application or Patent Cooperation Treaty (PCT) International application No. 14/306382 filed on 17 June 2014; (4) Zarate, C, Charney, DS, Manji, HK, Mathew, Sanjay J, Krystal, JH, Department of Veterans Affairs ‘Methods for Treating Suicidal Ideation’, Patent Application No. 14/197.767 filed on 5 March 2014 by Yale University Office of Cooperative Research; (5) Arias A, Petrakis I, Krystal JH. Composition and methods to treat addiction. Provisional Use Patent Application no. 61/973/961. 2 April 2014. Filed by Yale University Office of Cooperative Research; (6) Chekroud A, Gueorguieva R, Krystal JH. ‘Treatment Selection for Major Depressive Disorder’ (filing date 3 June 2016, USPTO docket number Y0087.70116US00). Provisional patent submission by Yale University; (7) Gihyun, Yoon, Petrakis I, Krystal JH Compounds, Compositions and Methods for Treating or Preventing Depression and Other Diseases. U.S. Provisional Patent Application No. 62/444552, filed on 10 January 2017 by Yale University Office of Cooperative Research OCR 7088 US01; and (8) Abdallah C, Krystal JH, Duman R, Sanacora G. Combination Therapy for Treating or Preventing Depression or Other Mood Diseases. U.S. Provisional Patent Application No. 62/719935 filed on 20 August 2018 by Yale University Office of Cooperative Research OCR 7451 US01.
Ethical standards
The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008.
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