Multivariate logistic regression
| Variable | OR 95%CI | p Value |
| Menopause age | 0.79 (0.63 to 0.996) | 0.046 |
| HRT (Yes vs No) | 0.23 (0.13 to 0.42) | <0.0001 |
| Pack years | 1.2 (1.08 to 1.33) | 0.001 |
| Current drinker (Yes vs No) | 0.55 (0.3 to 1.01) | 0.056 |
| Current smoker (Yes vs No) | 0.75 (0.39 to 1.43) | 0.38 |