Table 2.
Odds ratios and 95% confidence intervals for lung cancer and time to first cigarette in ever smokers, adjusting for different measures of smoking history.
| Time to first cigarette* | OR adjusted for pack- years of smoking | 95% CI | OR adjusted for total years of smoking | 95% CI | OR adjusted for cigarettes per day | 95% CI | OR adjusted for smoking status | 95% CI | OR adjusted for years since quitting | 95% CI |
|---|---|---|---|---|---|---|---|---|---|---|
| >60 min. | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | |||||
| 31–60 min. | 1.31 | 1.11–1.54 | 1.47 | 1.25–1.72 | 1.58 | 1.35–1.84 | 1.68 | 1.44–1.97 | 1.66 | 1.41–1.94 |
| 1–30 min. | 1.79 | 1.56–2.07 | 2.34 | 2.10–2.68 | 2.64 | 2.31–3.02 | 3.0 | 2.64–3.42 | 2.82 | 2.49–3.22 |
| Trend X2 | P<0.01 | P<0.01 | P<0.01 | P<0.01 | P<0.01 | |||||
| Whites | ||||||||||
| >60 min. | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | |||||
| 31–60 min. | 1.39 | 1.17–1.65 | 1.53 | 1.29–1.81 | 1.65 | 1.40–1.95 | 1.75 | 1.48–2.06 | 1.65 | 1.4–1.95 |
| 1–30 min. | 1.93 | 1.66–2.24 | 2.44 | 2.12–2.82 | 2.82 | 2.45–3.25 | 3.15 | 2.75–3.61 | 2.82 | 2.45–3.25 |
| Blacks | ||||||||||
| >60 min. | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | |||||
| 31–60 min. | 0.89 | 0.51–1.54 | 1.06 | 0.62–1.83 | 1.04 | 0.68–1.79 | 1.21 | 0.71–2.05 | 1.04 | 0.61–1.79 |
| 1–30 min. | 1.12 | 0.71–1.77 | 1.63 | 1.28–2.06 | 1.66 | 1.07–2.56 | 1.79 | 1.17–2.75 | 1.66 | 1.07–2.56 |
Odds ratios adjusted for age, sex, race, education, and body mass index. The odds ratios adjusted for years since quitting included current smokers.