Using unsupervised clustering approaches to identify common mental health profiles and associated mental healthcare service use patterns in Ontario, Canada.

Mental health is a complex, multidimensional concept that goes beyond clinical diagnoses, including psychological distress, life stress and well-being. This study aims to use unsupervised clustering approaches to identify multidimensional mental health profiles that exist in the population, and their associated service use patterns. The data source for this study is the 2012 Canadian Community Health Survey- Mental Health linked to administrative healthcare data holdings, included were all Ontario adult respondents. We used a Partioning Around Medoids clustering algorithm with Gower's proximity to identify groups with distinct combinations of mental health indicators and described them by their sociodemographic and service use characteristics. We identified four groups with distinct mental health profiles, including one group who met the clinical threshold for a depressive diagnosis, with the remaining three groups expressing differences in positive mental health, life stress and self-rated mental health. The four groups had different age, employment and income profiles and exhibited differential access to mental healthcare services. This study represents the first step in identifying complex profiles of mental health at the population level in Ontario, Canada. Further research is required to better understand the potential causes and consequences of belonging to each of the mental health profiles identified.

The adequacy of workplace accommodation and the incidence of permanent employment separations after a disabling work injury or illness.

OBJECTIVE: This study aimed to estimate the influence of the adequacy of employer accommodations of health impairments in predicting permanent separation from the employment relationship in a cohort of workers disabled by a work-related injury or illness. METHODS: The study used data from a retrospective, observational cohort of 1793 Ontario workers who participated in an interviewer-administered survey 18 months following a disabling injury or illness. The relative risks (RR) of a permanent employment separation associated with inadequate employer accommodations were estimated using inverse probability of treatment weights to reduce confounding. RESULTS: Over the 18-month follow-up, the incidence of permanent separation was 30.1/100, with 49.2% of separations related to health status. Approximately 51% of participants experiencing a separation were exposed to inadequate workplace accommodations, compared to 27% of participants in continuing employment. The propensity score adjusted RR of a health-related separation associated with inadequate accommodation was substantial [RR 2.72; 95% confidence interval (CI) 2.20-3.73], greater than the RR of separations not related to health (RR 1.68; 95% CI 1.38-2.21). CONCLUSIONS: Incidence of permanent separation in this cohort of Ontario labor force participants was approximately two times more frequent than would be expected. The adequacy of employer accommodation was a strong determinant of the risk of permanent separation. These findings emphasize the potential for strengthened workplace accommodation practices in this setting.

An observational study of pain severity, cannabis use, and benefit expenditures in work disability.

OBJECTIVE: This study pools two cohorts of workers in Ontario interviewed 18 months following a disabling work-related injury to estimate the association between pain severity, cannabis use, and disability benefit expenditures. METHODS: Among 1650 workers, disability benefit expenditures obtained from administrative records were combined with self-reported measures of pain symptoms and cannabis use. Disability benefit expenditures comprised wage replacement benefits and expenditures on healthcare services. RESULTS: Past-year cannabis use was reported by 31% of participants, with approximately one third of cannabis use attributed to the treatment of conditions arising from the work-related injury. Condition-related cannabis use was elevated among the 34% of participants reporting severe pain symptoms. In regression models adjusted for age, sex, nature of injury, opioid prescription, and pre-injury chronic conditions, participants reporting condition-related cannabis use had equivalent wage replacement benefit expenditures (ß = 0.254, ns) and higher healthcare benefit expenditures (ß = 0.433, p = 0.012) compared to participants who did not use cannabis. Participants reporting cannabis use unrelated to conditions arising from their work-related injury had lower wage replacement benefit expenditures (ß = - 0.309, p = 0.002) and equivalent healthcare benefit expenditures (ß = - 0.251, ns) compared to participants not using cannabis. CONCLUSION: This novel study of workers' compensation claimants interviewed at 18 months post-injury did not observe a substantial relationship between cannabis use and disability benefit expenditures, suggesting that neither harm nor significant benefit is associated with cannabis use. These findings contribute to understanding the potential benefits and risks associated with cannabis use in settings that have legalized cannabis use.

RéSUMé: OBJECTIF: Cette étude regroupe deux cohortes de travailleurs et travailleuses de l'Ontario interviewés 18 mois après un accident de travail invalidant; elle vise à estimer l'association entre la gravité de la douleur, la consommation de cannabis et les dépenses en prestations d'invalidité. MéTHODE: Les dépenses en prestations d'invalidité de 1 650 travailleurs et travailleuses, obtenues en consultant les dossiers administratifs, ont été combinées aux indicateurs autodéclarés de symptômes de douleur et de consommation de cannabis. Les dépenses en prestations d'invalidité englobaient les prestations de remplacement du salaire et les dépenses en services de soins de santé. RéSULTATS: Une consommation de cannabis au cours de la dernière année a été déclarée par 31 % des participants; environ le tiers de cette consommation de cannabis était imputée au traitement d'affections causées par l'accident de travail. La consommation de cannabis liée à une affection était élevée chez les 34 % de participants ayant déclaré de graves symptômes de douleur. Selon nos modèles de régression ajustés selon l'âge, le sexe, la nature de la blessure, la prescription d'opioïdes et l'existence d'états chroniques avant l'accident, pour les participants ayant déclaré une consommation de cannabis liée à une affection, les dépenses en prestations de remplacement du salaire étaient équivalentes (ß = 0,254, ns) et les dépenses en prestations de soins de santé étaient supérieures (ß = 0,433, p = 0,012) à celles des participants n'ayant pas consommé de cannabis. Pour les participants ayant déclaré une consommation de cannabis sans rapport avec des affections causées par leur accident de travail, les dépenses en prestations de remplacement du salaire étaient inférieures (ß = -0,309, p = 0,002) et les dépenses en prestations de soins de santé étaient équivalentes (ß = -0,251, ns) à celles des participants n'ayant pas consommé de cannabis. CONCLUSION: Cette étude novatrice menée auprès de demandeurs d'indemnités interviewés 18 mois après leur accident n'a pas observé de relation importante entre la consommation de cannabis et les dépenses en prestations d'invalidité, ce qui semble indiquer que ni des préjudices, ni des avantages significatifs ne sont associés à la consommation de cannabis. Ces constats contribuent à la compréhension des avantages et des risques qui pourraient être associés à la consommation de cannabis dans les milieux où cette consommation est légale.

Migraine and air pollution: A systematic review.

OBJECTIVE: To systematically synthesize evidence from a broad range of studies on the association between air pollution and migraine. BACKGROUND: Air pollution is a ubiquitous exposure that may trigger migraine attacks. There has been no systematic review of this possible association. METHODS: We searched for empirical studies assessing outdoor air pollution and any quantified migraine outcomes. We included short- and long-term studies with quantified air pollution exposures. We excluded studies of indoor air pollution, perfume, or tobacco smoke. We assessed the risk of bias with the World Health Organization's bias assessment instrument for air quality guidelines. RESULTS: The final review included 12 studies with over 4,000,000 participants. Designs included case-crossover, case-control, time series, and non-randomized pre-post intervention. Outcomes included migraine-related diagnoses, diary records, medical visits, and prescriptions. Rather than pooling the wide variety of exposures and outcomes into a meta-analysis, we tabulated the results. Point estimates above 1.00 reflected associations of increased risk. In single-pollutant models, the percent of point estimates above 1.00 were carbon monoxide 5/5 (100%), nitrogen dioxide 10/13 (78%), ozone 7/8 (88%), PM2.5 13/15 (87%), PM10 2/2 (100%), black carbon 0/1 (0%), methane 4/6 (75%), sulfur dioxide 3/5 (60%), industrial toxic waste 1/1 (100%), and proximity to oil and gas wells 6/13 (46%). In two-pollutant models, 16/17 (94%) of associations with nitrogen dioxide were above 1.00; however, more than 75% of the confidence intervals included the null value. Most studies had low to moderate risks of bias. Where differences were observed, stronger quality articles generally reported weaker associations. CONCLUSIONS: Balancing the generally strong methodologies with the small number of studies, point estimates were mainly above 1.00 for associations of carbon monoxide, nitrogen dioxide, ozone, and particulate matter with migraine. These results were most consistent for nitrogen dioxide.

Gender differences in authorship prior to and during the COVID-19 pandemic in research submissions to Occupational and Environmental Medicine (2017-2021).

OBJECTIVE: To explore whether the COVID-19 pandemic has impacted productivity of female academics in the field of occupational and environmental health, by examining trends in male and female authorship of submissions during and prior to the COVID-19 pandemic in Occupational and Environmental Medicine. METHODS: Administrative data on submissions between January 2017 and November 2021 were obtained through databases held at BMJ journals. Author gender was identified using an existing algorithm based on matching names to social media accounts. The number and proportion of female and male primary (first) and senior (last) authors were examined for each quarter, and the average change in share of monthly submissions from male authors in the months since the pandemic compared with corresponding months prior to the pandemic were identified using regression models estimating least squares means. RESULTS: Among 2286 (64.7%) and 2335 (66.1%) manuscripts for which first and last author gender were identified, respectively, 49.3% of prepandemic submissions were from male first authors, increasing to 55.4% in the first year of the pandemic (difference of 6.1%, 95% CI 1.3% to 10.7%), before dropping to 46.6% from April 2021 onwards. Quarterly counts identified a large increase in submissions from male authors during the first year after the onset of the pandemic, and a smaller increase from female authors. The proportion of male last authors did not change significantly during the pandemic. CONCLUSIONS: These findings suggest that there has been an increase in male productivity during the COVID-19 pandemic within the field of occupational and environmental health research that is present to a lesser extent among women.

The Association Between Case Manager Interactions and Serious Mental Illness Following a Physical Workplace Injury or Illness: A Cross-Sectional Analysis of Workers' Compensation Claimants in Ontario.

Poor mental health is a common occurrence among workers recovering from a work-related injury or illness. The objective of this cross-sectional study was to estimate the association between adverse interactions with workers' compensation case managers and experiencing a serious mental illness 18-months following a workplace injury or illness. A cohort of 996 workers' compensation claimants in Ontario Canada were interviewed 18 months following a disabling work-related injury or illness. Perceptions of informational and interpersonal justice in case manager interactions were defined as the primary independent variables, and Kessler Psychological Distress (K6) scores greater than 12, indicative of a serious mental illness, was defined as the outcome. Multivariate modified Poisson models estimated the association between perceptions of adverse case manager interactions and a serious mental illness, following adjustment for sociodemographic and work characteristics and pre-injury mental health. The prevalence of serious mental illness at 18 months was 16.6%. Low perceptions of informational justice, reported by 14.4% of respondents, were associated with a 2.58 times higher risk of serious mental illness (95% CI 1.30-5.10). Moderate and low perceptions of interpersonal justice, reported by 44.1% and 9.2% of respondents respectively, were associated with a 2.01 and 3.57 times higher risk of serious mental illness (95% CI moderate: 1.18-3.44, 95% CI poor: 1.81-7.06). This study provides further support for the impact of poor interactions with claims case managers on mental health, highlighting the importance of open and fair communication with workers' compensation claimants in ensuring timely recovery and return-to-work.

Prevalence of serious mental illness and mental health service use after a workplace injury: a longitudinal study of workers' compensation claimants in Victoria, Australia.

OBJECTIVES: Serious mental illness is common among those who have experienced a physical workplace injury, yet little is known about mental health service use in this population. This study aims to estimate the proportion of the workplace musculoskeletal injury population experiencing a mental illness, the proportion who access mental health services through the workers' compensation system and the factors associated with likelihood of accessing services. METHODS: A longitudinal cohort study was conducted with a random sample of 615 workers' compensation claimants followed over three survey waves between June 2014 and July 2015. The primary outcome was receiving any type of mental health service use during this period, as determined by linking survey responses to administrative compensation system records for the 18 months after initial interview. RESULTS: Of 181 (29.4%) participants who met the case definition for a serious mental illness at one or more of the three interviews, 75 (41.4%) accessed a mental health service during the 18-month observation period. Older age (OR=0.96, 95% CI 0.93 to 0.99) and achieving sustained return to work (OR=0.27, 95% CI 0.11 to 0.69) were associated with reduced odds of mental health service use. Although not significant, being born in Australia was associated with an increased odds of service use (OR=2.23, 95% CI 0.97 to 5.10). CONCLUSIONS: The proportion of injured workers with musculoskeletal conditions experiencing mental illness is high, yet the proportion receiving mental health services is low. More work is needed to explore factors associated with mental health service use in this population, including the effect of returning to work.

How Does Perceived Fairness in the Workers' Compensation Claims Process Affect Mental Health Following a Workplace Injury?

Purpose Mental health concerns are common after a workplace injury, particularly amongst those making a compensation claim. Yet there is a lack of research exploring the effect of modifiable elements of the return-to-work process on mental health. The aim of this study is to examine the impact of perceived injustice in the interactions between claim agents and claimants on mental health symptoms in the 12-month following a musculoskeletal (MSK) workplace injury. Methods A cohort of 585 workers compensation claimants in Victoria, Australia were interviewed three times over a 12-month period following a workplace MSK injury. Perceptions of informational and interpersonal justice in claim agent interactions were measured at baseline, and the Kessler Psychological Distress (K6) scale was administered as a measure of mental health at all three timepoints. Path analyses were performed to examine the direct and indirect effects of perceived justice at baseline on concurrent and future mental health, after accounting for confounding variables. Results Each 1-unit increase in perceptions of informational and interpersonal justice, indicating poorer experiences, was associated with an absolute increase of 0.16 and 0.18 in respective K6 mental health score at baseline, indicating poorer mental health on a 5-point scale. In addition, perceived justice indirectly impacted mental health at 6-month and 12-month, through sustained negative impact from baseline as well as increased risk of disagreements between the claim agent and claimant. Conclusions This finding has highlighted the importance of perceived justice in claim agent interactions with claimants in relation to mental health following a work-related MSK injury.