Table 5. Hazard ratios according to cigarette-years in women.
| Person-years | No of aases | Age-adjusted | Multivariate* | |
|
|
|
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| Hazard ratio (95% CI) | Hazard ratio (95% CI) | |||
| Non-smoker | 508462 | 220 | 1.00 (reference) | 1.00 (reference) |
| Past smoker | 8884 | 6 | 1.21 (0.54 - 2.72) | 1.18 (0.52 - 2.67) |
| Cigarette-years | ||||
| 1 - 399 | 18108 | 3 | 0.47 (0.15 - 1.45) | 0.48 (0.15 - 1.49) |
| 400 - 799 | 6918 | 6 | 1.85 (0.82 - 4.16) | 1.79 (0.79 - 4.05) |
| 800+ | 2007 | 0 | - | - |
* : Models included age, smoking, alcohol consumption, educational level, preference for salty foods and green-tea consumption.
CI : confidence interval.