Table 4. Comparison of prevalence of obesity and odds ratio for obesity in male smokers stratified by pack-years.
| Cochran-Mantel-Haenszel trend test | Multiple logistic regression | |||||||
|---|---|---|---|---|---|---|---|---|
| Smoking status | Pack-years | n | BMI | Prevalence of obesity (%) | P value† | Odds ratio* | 95% CI | P value |
| Current | ≤ 10 | 866 | 22.4±3.4 | 19.1 | <0.001 | 0.77 | 0.63–0.94 | 0.01 |
| 11–20 | 956 | 22.9±3.4 | 21.9 | 0.68 | 0.57–0.81 | < 0.001 | ||
| 21–30 | 854 | 23.1±3.1 | 24.7 | 0.78 | 0.65–0.93 | 0.006 | ||
| 31–60 | 1551 | 23.2±3.2 | 23.9 | 0.81 | 0.70–0.93 | 0.004 | ||
| 60 < | 475 | 23.4±3.4 | 28 | 1.05 | 0.84–1.30 | 0.67 | ||
| Past | ≤ 10 | 491 | 23.1±3.0 | 23.1 | <0.001 | 0.79 | 0.63–0.98 | 0.03 |
| 11–20 | 513 | 23.4±3.0 | 25.5 | 0.86 | 0.70–1.07 | 0.17 | ||
| 21–30 | 449 | 23.5±3.2 | 26.3 | 0.96 | 0.76–1.20 | 0.71 | ||
| 31–60 | 817 | 23.4±3.0 | 27.1 | 1.08 | 0.90–1.28 | 0.41 | ||
| 60 < | 315 | 23.7±3.3 | 34 | 1.55 | 1.20–1.99 | < 0.001 | ||
*Prevalence of obesity of never smokers was used as the reference value.
BMI, body mass index
†Each P value was calculated by Cochran-Mantel-Haenszel trend test among groups stratified by pack-years in current or past smokers.