We estimated that 5-6 years after enforcing the law, smoking prevalence among high-school students was 13.7% lower as a result of the ban. The decline in the target group was 2.9% (95% confidence interval, CI: 0.18 to 5.00) greater. Findingsįrom 2005 to 2011, the prevalence of smoking declined among high-school students by 6.8% per year compared with 3.6% decline per year in the control group.
The outcome measures were self-reported smoking prevalence (any smoking in the past month) and high frequency of smoking (smoking 15 days or more per month). Poisson regression models were used to assess trends in smoking behaviour before and after the policy changes. We conducted an interrupted time-series analysis, using repeated cross-sectional data from Chile's school population survey (2000-2011) for high-school students aged 12-18 years and a control group of persons aged 19-24 years. To evaluate the effect of a smoking ban in high schools on smoking behaviour among Chilean students.
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