Sampasa-Kanyinga Hugues, Hamilton Hayley A, LeBlanc Allana G, Chaput Jean-Philippe
Affiliations: School of Epidemiology and Public Health (Sampasa-Kanyinga), University of Ottawa, Ottawa, Ont.; Institute for Mental Health Policy Research (Hamilton), Centre for Addiction and Mental Health; Dalla Lana School of Public Health (Hamilton), University of Toronto, Toronto, Ont.; Division of Prevention and Rehabilitation (LeBlanc), University of Ottawa Heart Institute; Healthy Active Living and Obesity Research Group (Chaput), Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ont.
CMAJ Open. 2018 Jan 23;6(1):E50-E56. doi: 10.9778/cmajo.20170159.
Cannabis use can have serious detrimental effects in children and adolescents. It is therefore important to continually assess the use of cannabis among young people in order to inform prevention efforts. We assessed the prevalence of cannabis use among middle and high school students in Ontario and examined its association with demographic and behavioural factors.
Data were obtained from the 2015 Ontario Student Drug Use and Health Survey, a province-wide school-based survey of students in grades 7 through 12. Analyses included a representative sample of 9920 middle and high school students. Bivariate cross-tabulations and logistic regression analyses were used to investigate the factors associated with cannabis use.
Overall, 21.5% and 13.9% of students reported using cannabis in the previous year and previous month, respectively. The conditional probability that an adolescent who reported cannabis use in the previous year would report daily use was 12.5%. There was a significant dose-response gradient with age, with older students being more likely to use cannabis than younger students. In multivariable analyses, being in grades 10 through 12 (odds ratios [ORs] ranged from 3.71 to 3.85), being black (OR 2.67 [95% confidence interval (CI) 1.76-4.05]), using tobacco cigarettes (OR 10.10 [95% CI 8.68-13.92]) and being an occasional (OR 5.35 [95% CI 4.01-7.13]) or regular (OR 14.6 [95% CI 10.8-19.89]) alcohol user were associated with greater odds of cannabis use. Being an immigrant was associated with lower odds of cannabis use (OR 0.55 [95% CI 0.39-0.78]).
The findings suggest that cannabis use is prevalent among middle and high school students in Ontario and is strongly associated with tobacco cigarette smoking and alcohol consumption. Future research should document trends in cannabis use over time, including its risks, especially when the legalization of recreational cannabis comes into effect.
大麻使用会对儿童和青少年产生严重的有害影响。因此，持续评估年轻人中大麻的使用情况对于预防工作至关重要。我们评估了安大略省初中和高中学生中大麻使用的流行率，并研究了其与人口统计学和行为因素的关联。
数据来自2015年安大略省学生药物使用与健康调查，这是一项对全省7至12年级学生进行的基于学校的调查。分析纳入了9920名初中和高中学生的代表性样本。采用双变量交叉表和逻辑回归分析来研究与大麻使用相关的因素。
总体而言，分别有21.5%和13.9%的学生报告在前一年和前一个月使用过大麻。在前一年报告使用过大麻的青少年中，报告每日使用的条件概率为12.5%。年龄存在显著的剂量反应梯度，年龄较大的学生比年龄较小的学生更有可能使用大麻。在多变量分析中，10至12年级（优势比[OR]范围为3.71至3.85）、黑人（OR 2.67[95%置信区间(CI)1.76 - 4.05]）、使用香烟（OR 10.10[95%CI 8.68 - 13.92]）以及偶尔（OR 5.35[95%CI 4.01 - 7.13]）或经常（OR 14.6[95%CI 10.8 - 19.89]）饮酒与大麻使用的较高几率相关。移民与大麻使用的较低几率相关（OR 0.55[95%CI 0.39 - 0.78]）。
研究结果表明，大麻使用在安大略省的初中和高中学生中很普遍，并且与吸烟和饮酒密切相关。未来的研究应记录大麻使用随时间的趋势，包括其风险，特别是在休闲大麻合法化生效时。
