24-hour movement guidelines and suicidality among adolescents

The 24-hour movement guidelines for children and youth recommend ≥60 min/day of moderate-to-vigorous physical activity, ≤2 h/day of screen time, 9-11 h/night of sleep for 11-13 years and 8-10 h/night for 14-17 years. The objectives of this study were to examine the associations between meeting combinations of the recommendations contained within the 24-hour movement guidelines for children and youth and suicidal ideation and suicide attempts, and test whether age and gender moderate these associations.

Data on 10,183 students were obtained from the 2015-2017 Ontario Student Drug Use and Health Survey, a representative cross-sectional survey of Ontario students in grades 7-12 (mean [SD] age, 15.2 [1.8] years).

Suicidal ideation and suicide attempts were reported by 13.1% and 3.3% of students, respectively. Meeting individual recommendations or combinations of recommendations were differentially associated with suicidal ideation and suicide attempts between adolescent boys and girls and younger and older (three-way interactions statistically significant for both outcomes). Meeting all 3 recommendations was associated with lower odds of suicidal ideation (OR: 0.24, 95% CI: 0.09 - 0.69) and suicide attempts (OR: 0.08, 95% CI: 0.02 - 0.41) among boys aged 15 to 20 years, but not those aged 11 to 14 years nor girls in both age groups.

The cross-sectional nature of the data precludes causal inferences and there is possibility of bias related to self-reports.

These findings suggest that adherence to the 24-hour movement guidelines among adolescents is related to lower odds of suicidality in older boys.