COVID-19 Stress and Children’s Behavioural Problems: Exploratory Moderation by Child Resilience and Sex Assigned at Birth in a Canadian-Based Longitudinal Cohort

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Background: The COVID-19 pandemic increased stress experienced by children through individual-, family-, and community-level factors, with potential sex-specific impacts on behavioural outcomes. Children’s resilience may buffer these effects. This exploratory study investigated associations between COVID-19 stress and children’s internalising, externalising, and overall behavioural symptoms, and whether child resilience and sex assigned at birth moderated these associations. Methods: Data (N = 68) came from the longitudinal COVID-19 Impact Study of the Canadian APrON pregnancy cohort of mothers and their children followed for more than 9 years. COVID-19 stress, combining individual-, family-, and community-level stressors, was reported by mothers (mean age = 42.37, SD = 3.72) and their children (53% female; mean age = 10.21 years, SD = 0.43) across three timepoints (October–December 2020; February–May 2021; June–August 2021). Children’s behavioural problems and self-reported resilience were assessed between April and September 2022. Results: COVID-19 stress was not significantly associated with children’s behavioural problems. Moderated-moderation suggested that the association between COVID-19 stress and children’s internalising (T-score estimate = −2.38, 95% CI [−4.08, −0.68]), externalising (T-score estimate = −3.21, 95% CI [−5.09, −1.33]), and overall (T-score estimate = −2.79, 95% CI [−4.45, −1.12]) symptoms may vary by child resilience and child sex assigned at birth. Among females, COVID-19 stress appeared to be associated with more behavioural problems at lower levels of resilience and fewer problems at higher levels of resilience. Significance: The association between COVID-19 stress and children’s behavioural symptoms across children’s resilience levels may vary based on sex assigned at birth, with effects suggested among females. Null findings may reflect the modest sample size and limited statistical power.

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