Regular monitoring of trends in sexual health behaviours of adolescents is required to guide evidence-based intervention programs and health policies. The purpose of this study was to examine national trends in sexual behaviours of Canadian adolescents from 2002 to 2014. Method: A secondary analysis of data was conducted using the Canadian Health Behaviour in School-Aged Children (HBSC) survey of Grade 9 and 10 students over four survey cycles. Sexual behaviours of interest were ever having sexual intercourse, early onset of sexual intercourse, and oral contraceptive, condom, and dual method use at last intercourse. Disaggregated by gender and survey cycle, data were analyzed using cross-tab analyses and aged-adjusted logistic regressions. From 2002 to 2014, boys had decreasing trends in early onset of sexual intercourse [AOR = 0.55, 95% CI = (0.36-0.85), p = 0.008], and increasing trends in oral contraceptive use [AOR = 1.94, 95% CI = (1.24-3.04), p = 0.004]. During this time, girls had decreasing trends in condom use [AOR = 0.64, 95% CI = (0.41-1.00), p = 0.052], but increasing trends in oral contraceptive use [girls: AOR = 1.47, 95% CI =(0.98-2.19), p= 0.061] approaching statistical significance. No significant trends were noted in ever having sexual intercourse and dual method use for both genders. In sum, boys showed improvements in sexual behaviours over time. The inverse trends of condom use and oral contraceptive use suggested girls' increasing reliance on oral contraceptive pills instead of condoms. Health services interventions and policies should consider implementing new strategies that better promote dual method use.


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pp. 17-25
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