From: Cigarette smoking associated with chronic pancreatitis: a case control study in China
 | Smoking intensity (cigarettes/d) |  | Smoking intensity (cigarettes/d) |  | ||||
---|---|---|---|---|---|---|---|---|
Variable | < 20 |  |  |  | ≥ 20 |  |  |  |
OR | 95.0% CI | Â | P value | OR | 95.0% CI | Â | P value | |
 | Lower | Upper |  |  | Lower | Upper |  | |
All subjects | 0.779 | 0.424 | 1.431 | 0.421 | 1.595 | 0.979 | 2.598 | 0.061 |
Male | 0.896 | 0.436 | 1.842 | 0.766 | 1.912 | 1.066 | 3.428 | 0.030* |
Age ≥ 30 years | 0.851 | 0.45 | 1.61 | 0.62 | 1.663 | 1.012 | 2.732 | 0.045* |
Male, Age ≥ 30 years | 0.966 | 0.463 | 2.015 | 0.927 | 2.023 | 1.112 | 3.68 | 0.021* |
Male, Age ≥ 30 years, without biliary disease | 0.926 | 0.371 | 2.311 | 0.87 | 2.11 | 0.951 | 4.684 | 0.066 |