Table 3

 Relationship between duration of local restaurant smoking regulations and progression to established smoking* among Massachusetts youth cohort†

OR‡ (95% CI)
*Progression to established smoking was defined as smoking 100 or more cigarettes in one’s life.
†Cohort includes only youths who were not established smokers (that is, had smoked fewer than 100 cigarettes in their life) at baseline.
‡Odds ratio for progression to established smoking. Odds ratio is derived from GEE logistic regression model that accounts for clustering of responses within towns. Data are weighted to account for baseline probability of respondent selection. Odds ratios are adjusted for all other variables in the analysis.
§Strength of local restaurant smoking regulation was defined as strong if it banned smoking completely in all restaurants with no variances, medium if it banned smoking but allowed variances or restricted smoking to enclosed, separately ventilated areas, and weak if it required only designated smoking areas or did not restrict smoking at all.
Strength§ and duration of local restaurant smoking regulation
    Medium§1.04 (0.68 to 1.59)
    Strong§—in effect <2 years0.55 (0.33 to 0.90)
    Strong§—in effect ⩾2 years0.11 (0.03 to 0.37)