P153: The CIMA-Q and CompAS cohort studies on factors associated with Alzheimer's disease (AD): Exploring sociodemographic, health and neuropsychological profile of Subjective Cognitive Decline (SCD) participants from two culturally differentiated samples.

Abstract

Objective:

To explore commonalities and differences in the sociodemographic, health, and neuropsychological characteristics of participants with SCD recruited in two culturally differentiated cohort studies, namely CIMA-Q (Canada; Bellevile et al., 2019) and CompAS (Spain; Juncos et al., 2012).

Methods:

Older adults with subjective cognitive complaints of the CompAS (N=251; 68.92% women; Control: 30.3%; SCD: 25.9%; MCI: 28.7%) and the CIMA-Q (N=179; 71.5% women; Control:16.1%; SCD: 36.8%; MCI:28.6%) were recruited, respectively, from primary care centers and memory clinics, excluding patients with dementia and other neurological or psychiatric disturbances. Cognitive complaints were assessed considering coincident items of the QAM and MFE questionnaires. Cut-off points for the 5%ile were calculated independently in both samples and according to this, participants were classified as SCD or controls (CompAS: N= 141; CIMA-Q: N=161) considering complaints relevance at baseline (Pereiro et al., 2021). Participants underwent neuropsychological assessment. Participants diagnosed as Mild Cognitive Impairment (MCI) were excluded from the analysis. Between cohort-studies and inter-group (control, SCD) differences were tested in the sociodemographic, health and neuropsychological measures considered. The Holm-Bonferroni correction was applied to reduce the probability of type I error (p<.003).

Results:

Identical cut-off points for 5%ile were obtained in both samples though SCD prevalence was slightly higher in CIMA-Q. For both samples, equivalence between Control and SCD participants in sociodemographic, health, functionality, and neuropsychological measures was observed. Only complaints and depressive symptomatology was significantly higher in SCD participants than in controls in both CompAS and CIMA-Q studies.

Participants of the CIMA-Q, Controls and SCD, showed significantly higher age, cognitive reserve proxies, comorbidity, and better attentional performance than the CompAS participants (see Table 1). CompAS participants, Controls and SCD, showed more neuropsychiatric symptomatology than CIMA-Q participants (see Table 1).

Conclusions:

Control and SCD participants showed equivalence on sociodemographic, health, functional, and neuropsychological measures in both studies. However, significant between-sample differences in the two groups, particularly in SCD participants, were observed in sociodemographic, health, cognitive reserve, behavioral and attentional measures. Identification of these factors are critical to analyze the transcultural validity of cognitive complaints in predicting progression to AD.

Table 1

Between group (control, SCD) and Between study (CIMA-Q, CompAS) differences in sociodemographic, health, and cognitive measures

	CIMA-Q	CompAS	Between-studies differences
	Between-group differences	Between-group differences	Control	SCD
Sociodemographics
Age	NS	NS	CIMA-Q>CompAS; F(1,124)=22.78; p<.001	CIMA-Q>CompAS; F(1,172)=36.97; p<.001
Gender	NS	NS	NS	NS
Schooling (years)	NS	NS	NS	CIMA-Q>CompAS; F(1,172)=20.74; p<.001
Prof. qualification	NS	NS	CIMA-Q>CompAS; χ24=18.18; p=001	CIMA-Q>CompAS; χ24=33.95; p<001
Cognitive reserve (quartiles)	NS	NS	CIMA-Q>CompAS; χ23=13.57; p=004	CIMA-Q>CompAS;χ23==42.56; p<001
Memory familiar antecedents	NS	NS	NS	CIMA-Q>CompAS; χ21==15.03; p<001
Neuropsychology
Subjective complaints*	SCD>Control; F(1,119)=147.17, p<.001)	SCD>Control; F(1,177)=192.87, p<.001	NS	NS
Charlson Index*	SCD>Control; F(1,115)=5.29, p=.023	NS	CIMA-Q>CompAS; F(1,123)=394.96; p<.001	CIMA-Q>CompAS; F(1,168)=335.98; p<.001
General cognition	NS (MoCA)	NS (CAMCOG-R)	--	--
GDS-15*	SCD>Control; F(1,119)=8.60, p=.004	SCD>Control; F(1,176)=11.97, p<.001	NS	NS
TMT-A (secs.)*	NS	NS	NS	NS
TMT-B (secs.)*	NS	NS	CompAS>CIMA-Q; F(1,118)=12.56; p<.001	CompAS>CIMA-Q; F(1,163)=21.74; p<.001
Verbal fluency	NS	NS	NS	NS
Semantic fluency	NS	NS	NS	NS
Boston test	NS	NS	NS	NS
NPI-Q	NS	NS	CompAS>CIMA-Q; F(1,119)=16.68; p<.001	CompAS> CIMA-Q; F(1,162)=24.46; p<.001
Immediate recall (RAVL test)	NS	NS	NS	NS
Short delay (RAVL test)	NS	NS	NS	NS
Long delay(RAVL test)	NS	NS	NS	NS
Intrusions (RAVL test)	NS	NS	NS	NS
IAVD*	NS	NS	NS	NS

Note: *On these measures, higher scores denote worse cognition or health condition. TMT: Trail Making Test (A and B forms); NPI-Q: Neuropsychiatric Inventory-Questionnaire; RAVL: Rey Auditory Verbal Learning; IAVD: Instrumental Activity of Daily Living.