However, when exposure to tobacco imagery in films was included as a graded variable with exposure categorized into tertiles of the number of intervals containing smoking imagery in the films, relative to no exposure, there was a significant trend of increasing susceptibility with increasing tertile of exposure, with an odds ratio for the highest tertile relative to no exposure of 1.4 (95% CI: 1.0–2.1, p trend <0.001).
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Prospective study of exposure to smoking imagery in films and changes in susceptibility to smoking in a cohort of school students in Southern India.
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