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Abstract: Regular monitoring of trends in sexual health and sexual behaviours among adolescents provides strong evidence to guide intervention programs and health policies. Using the province-wide, school-based British Columbia (BC) Adolescent Health Surveys of 1992, 1998, and 2003, this study documented the trends in sexual health and risk behaviours among adolescents in grades 7 to 12 in BC, and explored the associations between sexual behaviours and key risk and protective factors. From 1992 to 2003, the percentage of youth who had ever had sexual intercourse decreased for both males (33.9% to 23.3%) and females (28.6% to 24.3%) and the percentage who used a condom at last intercourse increased for both males (64.4% to 74.9%) and females (52.9% to 64.2%). Among students who had ever had sexual intercourse, the percentage who had first intercourse before age 14 decreased for both sexes. These encouraging results may be related in part to concurrent decreases in the prevalence of sexual abuse or forced intercourse among both male and female adolescents. Protective factors such as feeling connected to family or school were also associated with lower odds of having engaged in risky sexual behaviours. These findings emphasize the importance of including questions about adolescent sexual health behaviours, risk exposures, and protective factors on national and provincial youth health surveys, to monitor trends, inform sexual health promotion strategies and policies, and to document the effectiveness of population-level interventions to foster sexual health among Canadian adolescents.
Introduction
Healthy sexual development is a key developmental task of adolescence, yet to what extent are we tracking either sexual health behaviours or sexual risk behaviours among young people in Canada? In 2001, Maticka-Tyndale called for better, more regularly gathered population-level sexual health data for adolescents, both nationally and provincially, including information about healthy behaviours, not just the vital statistics about outcomes such as births and abortions or sexually transmitted infection (STI) rates. Some of our national surveys of youth have begun including questions related to sexual behaviour, although they may limit that to older adolescents, as does the Health Behaviour of School-Aged Children (Boyce, King, & Roche, 2008), or to a small number of general questions, most commonly whether the teens have ever had sexual intercourse, ever had or caused a pregnancy, and possibly whether they used contraception or condoms at last intercourse. Sexual behaviour questions are a relatively recent addition to national youth surveys, so trends with three or more points of data are not yet available.
Even at the provincial level, very few population-based adolescent surveys ask about sexual behaviour. Some, such as the Student Drug Use Surveys of the Atlantic provinces, have recently included items related to sexual health and risk (Poulin, 2002; Poulin & Elliott, 2007). As with the national surveys, these include a limited number of behavioural items, although the number of questions increased in the 2007 survey compared to 2002.
British Columbia stands out as an exception in sexual health population monitoring of adolescents in Canada. Since 1992, the McCreary Centre Society has conducted the BC Adolescent Health Survey (BC AHS) every 5-6 years throughout the province, and from the beginning, included several questions related to sexual health behaviours, sexual risk behaviours, and sexual health outcomes. At the same time, the BC AHS has included questions about key risk factors for sexual health problems, and a number of protective factors that have been associated with healthy sexual development for adolescents in population-based research in other countries. The BC AHS remains the oldest and largest cluster-stratified population-based provincial adolescent health survey to assess sexual health information for younger and older adolescents in school.