Logistic regression model comparing never-smokers to smokers
| Variable | Odds Ratio | 99% Confidence interval |
|---|---|---|
| Age | 1.09 | 1.06–1.12 |
| Gender | 0.60 | 0.37–0.99 |
| Ethnicity (vs Euro-Americans) | ||
| African-American | 0.37 | 0.31–0.45 |
| Hispanic-Americans | 0.52 | 0.43–0.63 |
| Other | 0.68 | 0.56–0.82 |
| Income level | 1.12 | 1.06–1.19 |
| Education level | 0.73 | 0.67–0.80 |
| Marital status | 1.37 | 1.17–1.61 |
| Percentage of friends who smoke | 2.65 | 2.52–2.79 |
| Percentage of Air Force personnel who smoke | 0.82 | 0.76–0.89 |
| Smoking is socially attractive | 3.61 | 3.43–3.79 |
| Alcohol use | 1.33 | 1.25–1.42 |
| Frequency of binge drinking (⩾8 drinks/day) | 1.15 | 1.06–1.24 |
| Smokeless tobacco use | 1.94 | 1.61–2.34 |
| Self-rated physical activity level | 0.80 | 0.76–0.85 |
| Frequency of weight concerns | 0.83 | 0.76–0.91 |
| Frequency of dieting to lose weight | 0.82 | 0.75–0.90 |
| Gender × frequency of binge drinking | 1.16 | 1.01–1.35 |
| Gender × self-rated physical activity level | 1.15 | 1.03–1.27 |
| Gender × frequency of weight concerns | 1.19 | 1.04–1.36 |
Percentage of friends who smoke coded as 1 = >20%; 2 = 20–49%; 3 = 50–79%; 4 = ⩾80%. Frequency of binge drinking coded as 1 = never; 2 = a few times per year; 3 = a few times per month; 4 = a few times per week; 5 = every day. Self-rated physical activity coded on a 5-point scale from 1 = much less physically active than other to 5 = much more physically active than others. Frequency of weight concerns and frequency of dieting to lose weight coded on a Likert scale with four categories: never; sometimes; frequently; and always. Remaining variables coded as in table 3.