Table 3.
Odds Ratiosa for Associations Between Cross-Classified Smoking Duration and Smoking Intensity and Risk of Nasopharyngeal Carcinoma Among Ever Smoking Men (With Never Smokers as the Referent), Guangdong Province and Guangxi Autonomous Region, China, 2010–2014
| Duration of Smoking, years | No. of Cigarettes Smoked per Day | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0b | <10 | 10–19 | 20–29 | ≥30 | ||||||
| OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| 0b | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| <10 | 0.70 | 0.41, 1.19 | 0.83 | 0.49, 1.42 | 1.26 | 0.73, 2.17 | 0.73 | 0.19, 2.82 | ||
| 10–19 | 0.74 | 0.47, 1.16 | 0.72 | 0.51, 1.02 | 1.02 | 0.75, 1.40 | 1.19 | 0.63, 2.24 | ||
| 20–29 | 1.71 | 1.20, 2.44 | 1.27 | 0.95, 1.72 | 1.12 | 0.88, 1.43 | 1.24 | 0.83, 1.85 | ||
| ≥30 | 1.39 | 1.08, 1.79 | 1.39 | 1.06, 1.81 | 1.58 | 1.22, 2.04 | 1.90 | 1.30, 2.78 | ||
Abbreviations: CI, confidence interval; OR, odds ratio.
a Adjusted for age, geographic area, and time since smoking cessation.
b Never smokers were the reference group for all comparisons.