| Smoking | Cases (n = 316) | Controls (n = 350) | OR (95% CI) P value | Weighted OR (95% CI) P valuea | Weighted OR (95% CI) P valueb |
| No | 212 (67.1) | 265 (75.7) | Reference | Reference | Reference |
| Past | 4 (1.3) | 4 (1.1) | 1.25 (0.31, 5.06) 0.754 | 1.29 (0.31, 5.36) 0.726 | 1.67 (0.38,7.38) 0.496 |
| Current | 100 (31.6) | 81 (23.1) | 1.54 (1.09, 2.18) 0.013 | 1.58 (1.09, 2.30) 0.016 | 1.50 (1.01, 2.23) 0.047 |