Do provincial policies banning smoking in cars when children are present impact youth exposure to secondhand smoke in cars?
Menée à partir des données 2004-2012 d'une enquête auprès de 91 800 adolescents âgés de 11 à 14 ans, cette étude analyse pour 7 provinces canadiennes l'évolution de l'exposition des jeunes au tabagisme passif dans les voitures avant et après la mise en place d'une interdiction de fumer dans les véhicules en présence d'enfants
Objective : To examine youth exposure to smoking in cars following 7 provincial bans on smoking in cars with children in Canada. Method : Repeated cross-sectional data from the 2004-2012 Youth Smoking Survey (n= 91,800) were examined. Using a quasi-experimental design, contrasts of the interaction of survey year and province included in the logistic regression analyses were used to test whether exposure significantly declined pre-post implementation of a ban on smoking in cars relative to control provinces not implementing a ban. Results : Exposure across all provinces declined from 26.5% in 2004 to 18.2% of youth in 2012. Exposure declined significantly from pre to post implementation of a ban on smoking in cars with children in Ontario at time 1 post ban (Pre-Ban=20.4% T1post=10.3%, OR=0.45), time 2 post ban (12.1%, OR=0.61) and time 3 post ban (11.6%, OR=0.58) relative to control provinces that did not implement a ban. In British Columbia exposure to smoking in cars declined significantly at pre-post ban time 3 compared to the control group (Pre-Ban=21.2%, T3post=9.6%, OR=0.51). No other provinces had a significant change in exposure pre-post ban relative to the control provinces. Interpretation : Although rates declined, significant differences were only found in Ontario relative to control provinces in the immediate and long term.
Preventive Medicine 2015