Mass gatherings are events where many people come together at a specific location for a specific purpose, such as concerts, sports events, or religious gatherings, within a certain period of time. In mass-gathering studies, many rates and ratios are used to assess the demand for medical resources. Understanding such metrics is crucial for effective planning and intervention efforts. Therefore, this systematic review aims to investigate the usage of rates and ratios reported in mass-gathering studies.

In this systematic review, the PRISMA guidelines were followed. Articles published through December 2023 were searched on Web of Science, Scopus, Cochrane, and PubMed using the specified keywords. Subsequently, articles were screened based on titles, abstracts, and full texts to determine their eligibility for inclusion in the study. Finally, the articles that were related to the study’s aim were evaluated.

Out of 745 articles screened, 55 were deemed relevant for inclusion in the study. These included 45 original research articles, three special reports, three case presentations, two brief reports, one short paper, and one field report. A total of 15 metrics were identified, which were subsequently classified into three categories: assessment of population density, assessment of in-event health services, and assessment of out-of-event health services.

The findings of this study revealed notable inconsistencies in the reporting of rates and ratios in mass-gathering studies. To address these inconsistencies and to standardize the information reported in mass-gathering studies, a Metrics and Essential Ratios for Gathering Events (MERGE) table was proposed. Future research should promote consistency in terminology and adopt standardized methods for presenting rates and ratios. This would not only enhance comparability but would also contribute to a more nuanced understanding of the dynamics associated with mass gatherings.

Case reports are commonly used to report the health outcomes of mass gatherings (MGs), and many published reports of MGs demonstrate substantial heterogeneity of included descriptors. As such, it is challenging to perform rigorous comparisons of health services and outcomes between similar and dissimilar events. The degree of variation in published reports has not yet been investigated.

Examine patterns of post-event medical reporting in the existing literature and identify inconsistencies in reporting.

A systematic review of case reports was conducted. Included were English studies, published between January 2009 and December 2018, in Prehospital and Disaster Medicine (PDM) or Current Sports Medicine Reports (CSMR). Analysis of each paper was used to develop a list of 27 categories of data.

Seventy-five studies were initially reviewed with 54 publications meeting the inclusion criteria. Forty-two were full case reports (78%) and 12 were conference proceedings (22%). Of the 27 categories of data studied, only 13 were consistently reported in more than 50% of publications. Reporting patterns included inconsistent use of terminology/language and variable retrievability of reports. Reporting on event descriptors, hazard and risk analysis, and clinical outcomes were also inconsistent.

Case reports are essential tools for researchers and event team members such as medical directors and event producers. The authors found that current case reports, in addition to being inconsistent in content, were generally descriptive rather than explanatory; that is, focused on describing the outcomes as opposed to exploring possible connections between context and health outcomes.

This paper quantifies and demonstrates the current state of heterogeneity in MG event reporting. This heterogeneity is a significant impediment to the functional use of published reports to further the science of MG planning and to improve health outcomes. Future work based on the insights gained from this analysis will aim to align and standardize reporting to improve the quality and value of event reporting.

The aim of this study was to examine the various modern music genres and their effect on the utilization of medical resources with analysis and adjustment for potential confounders.

A retrospective review of patient logs from an open-air, contemporary amphitheater over a period of 10 years was performed. Variables recorded by the medical personnel for each concert included the attendance, description of the weather, and a patient log in which nature and outcome were recorded. The primary outcomes were associations of genres with the medical usage rate (MUR). Secondary outcomes investigated were the association of confounders and the influences on the level of care provided, the transport rate, and the nature of medical complaint.

A total of 2,399,864 concert attendees, of which 4,546 patients presented to venue Emergency Medical Services (EMS) during 403 concerts with an average of 11.4 patients (annual range 7.1-17.4) each concert. Of potential confounders, only the heat index ≥90°F (32.2°C) and whether the event was a festival were significant (P=.027 and .001, respectively). After adjustment, the genres with significantly increased MUR in decreasing order were: alternative rock, hip-hop/rap, modern rock, heavy metal/hard rock, and country music (P<.05). Medical complaints were significantly increased with alternative rock or when the heat index was ≥90°F (32.2°C; P<.001). Traumatic injuries were most significantly increased with alternative rock (P<.001). Alcohol or drug intoxication was significantly more common in hip-hop/rap (P<.001). Transport rates were highest with alcohol/drug intoxicated patients (P<.001), lowest with traumatic injuries (P=.004), and negatively affected by heat index ≥90°F (32.2°C; P=.008), alternative rock (P=.017), and country music (P=.033).

Alternative rock, hip-hop/rap, modern rock, heavy metal/hard rock, and country music concerts had higher levels of medical resource utilization. High heat indices and music festivals also increase the MUR. This information can assist event planners with preparation and resource utilization. Future research should focus on prospective validation of the regression equation.

Westrol MS, KoneruS, McIntyreN, Caruso AT, ArshadFH, MerlinMA. Music Genre as a Predictor of Resource Utilization at Outdoor Music Concerts. Prehosp Disaster Med. 2017;32(3):289–296.

Formula One returned to the United States on November 16-18, 2012, with the inaugural United States Grand Prix in Austin, Texas. Medical preparedness for motorsports events represents a unique challenge due to the potential for a high number of spectators seeking medical attention, and the possibility for a mass-casualty situation. Adequate preparation requires close collaboration across public safety agencies and hospital networks to minimize impact on Emergency Medical Services (EMS) resources.

To report the details of preparation for an inaugural mass-gathering motorsports event, and to describe the details of the medical care rendered during the 3-day event.

A retrospective analysis was completed utilizing postevent summaries, provided by the medical planning committee, by the Federation Internationale de L'Automobile (FIA), and Austin Travis County Emergency Medical Services (ATCEMS). Patient data were collected from standardized patient care records for descriptive analysis. Medical usage rates (MURs) are reported as a rate of patients per 10,000 (PPTT) participants.

A total of 566 patients received medical care over the 3-day period with the on-site care rate of 95%. Overall, MUR was 21.3 PPTT attendees. Most patients had minor problems, and there were no driver injuries or deaths.

This mass-gathering motorsport event had a moderate number of patients requiring medical attention. The preparedness plan was implemented successfully with minimal impact on EMS resources and local medical facilities. This medical preparedness plan may serve as a model to other cities preparing for an inaugural motorsports event.

SabraJP , CabañasJG , BedollaJ , BorgmannS , HawleyJ , CravenK , BrownC , ZiebellC , OlveyS . Medical Support at a Large-scale Motorsports Mass-gathering Event: The Inaugural Formula One United States Grand Prix in Austin, Texas. Prehosp Disaster Med. 2014;29(4):1-7.

The review was conducted to evaluate if the field of mass-gathering medicine has evolved in addressing: (1) the lack of uniform standard measures; (2) the effectiveness of and needs for various interventions during a mass gathering; and (3) the various types of noncommunicable health issues (trauma and medical complaints) encountered and their severity during a gathering.

A systematic review of papers published from 2003 through 2012 was conducted using databases of MEDLINE, Ovid, CINHAL, EBSCOHost, National Library of Medicine (NLM), Agency for Healthcare Research and Quality (AHRQ), Elsevier, Scopus, and Proquest databases. Of 37,762 articles, 17 articles were included in this review, covering 18 mass-gathering events; 14 were multiple-day events.

Across all events, the patient presentation rate (PPR) ranged from 0.13 to 20.8 patients per 1,000 attendees and the transfer to hospital rate (TTHR) ranged from 0.01 to 10.2 ambulance transports per 1,000 attendees. In four out of the seven studies, having on-site providers was associated with a lower rate of ambulance transports. The highest frequencies of noncommunicable presentations were headaches, abdominal complaints, and abrasions/lacerations. Most presentations were minor. Emergent cases requiring hospitalization (such as acute myocardial infarction) were rare.

The rate of noncommunicable health issues varies across events and very serious emergencies are rare.

AlquthamiAH , PinesJM . A Systematic Review of Noncommunicable Health Issues in Mass Gatherings. Prehosp Disaster Med. 2014;29(2):1-9.

Mass gatherings create difficult environments for which to plan emergency medical responses. The purpose of this study was to identify those variables that are associated with increased medical usage rates (MURs) and certain injury patterns that can be used to facilitate the planning process.

Patient information collected at three types of mass gatherings (professional American football and baseball games and rock concerts) over a three-year period was reviewed retrospectively. Specific variables were abstracted: (1) event type; (2) gender; (3) age; (4) weather; and (5) attendance. All 216 events (total attendance9,708,567) studied were held in the same metropolitan region. All MURs are reported as patients per 10,000 (PPTT).

The 5,899 patient encounters yielded a MUR of 6.1 PPTT. Patient encounters totaled 3,659 for baseball games (4.85 PPTT), 1,204 for football games (6.75 PPTT), and 1,036 for rock concerts (30 PPTT). The MUR for Location A concerts (no mosh pits) was 7.49 PPTT, whereas the MUR for the one Location B concert (with mosh pits) was110 PPTT. The MUR for Location A concerts was higher than for baseball, but not football games (p = 0.005). Gender distribution was equal among patrons seeking medical care. The mean values for patient ages were 29 years at baseball games, 33 years at football games, and 20 years at concerts. The MUR at events held when the apparent temperature was £80°F significantly lower statistically than that at events conducted at temperatures <80°F were (18°C) (4.90 vs. 8.10 PPTT (p = 0.005)). The occurrence of precipitation and increased attendance did not predict an increased MUR. Medical care was sought mostly for minor/basic-level care (84%) and less so for advanced-level care (16%). Medical cases occurred more often atsporting events (69%), and were more common than were cases with traumatic injuries (31%). Concerts with precipitation and rock concerts had a positive association withthe incidence of trauma and the incidence of injuries; whereas age and gender were not associated with medical or traumatic diagnoses.

Event type and apparent temperature were the variables that best predicted MUR as well as specific injury patterns and levels of care.