Psychological Mediators of the Associations Between Pandemic-Related Stressors and Suicidal Ideation Across Three Periods of the COVID-19 Pandemic in Canada

Background: The COVID-19 pandemic's mental health impact is well-established. While early evidence suggested suicide deaths remained stable or declined, suicidal ideation (SI) became more prevalent than before the pandemic. Our study: (1) examined the prevalence and distribution of SI among Canadian adults, (2) compared SI among those with and without pre-existing mental illnesses, and (3) evaluated associations between pandemic-related stressors (i.e., unemployment, insecure employment, loss of income, medical vulnerability, COVID-19 exposure) with SI, and whether such associations were mediated by depression, thwarted belong-ingness, perceived burdensomeness, or perceived discrimination.Methods: The sample was comprised of data gathered at three timepoints (Wave 1 08/18/2020-10/01/2020, n = 6629; Wave 2 12/21/2020-03/31/2021, n = 5920; Wave 3 09/07/2021-12/07/2021, n = 7354). Quota-based responses from survey research panels which matched the geographic, age, and sex distribution of the Canadian population were supplemented with convenience-sampled responses.Results: The prevalence of SI was 4.1 % (Wave 1), 5.3 % (Wave 2), and 5.8 % (Wave 3). Odds of SI were higher for respondents under the age of 35 years and with pre-existing mental illnesses. SI was associated with quarantining due to suspected or confirmed COVID-19 exposure, potential COVID-19 exposure at work, medical vulnerability toward COVID-19, insecure employment or unemployment, and income loss. These associations were mediated by psychological experiences, particularly depression and thwarted belongingness. Limitations: This cross-sectional, observational study cannot establish temporality or causality.Conclusion: Results highlight groups who may benefit from enhanced screening for depression and suicide risk. Reducing depression and increasing sense of belonging should be prioritized.