Table 2 Logistic regression analyses examining factors associated with beliefs about smoking in the home and in cars among youth in grades 5–9 in Canada, 2004
 Parameters Coding Adjusted odds ratio† (95% CI) Model 1 Model 2 Smoking should not be allowed around children at home? Smoking should not be allowed around children in cars? Sex Female 1.00 1.00 Male 1.38 (1.28 to 1.51)** 1.39 (1.27 to 1.51)** Have you ever smoked a whole cigarette? Yes 1.00 1.00 No 2.83 (2.53 to 3.18)** 2.96 (2.65 to 3.32)** Parental smoking No parent(s) smoke 1.00 1.00 At least 1 parent smokes 1.20 (0.91 to 1.16) 0.95 (0.84 to 1.07) Excluding yourself, how many people smoke inside your home every day or almost every day?‡ None 1.00 1.00 1 or more people 1.20 (1.05 to 1.38)* 1.21 (1.06 to 1.38)* What are the rules about smoking in your home? No smoking inside 1.00 1.00 Smoking is allowed inside 2.07 (1.87 to 2.30)** 1.76 (1.59 to 1.95)** During the past 7 days, on how many days did you ride in a car with someone who was smoking cigarettes? 0 days 1.00 1.00 1 or more days 1.54 (1.38 to 1.71)** 1.73 (1.56 to 1.93)** c Statistic 0.692 0.688
• *p<0.01 **p<0.001.

• †Odds ratios adjusted for all other variables in the table and controlling for grade: model 1, 1 = no (n = 25 271), 0 = yes or I don’t know (n = 2404); model 2: 1 = no (n = 25 070), 0 = yes or I don’t know (n = 2612).

• ‡Does not count those who smoke outside.