Most recent regular amount of cigarettes smoked per day before the onset of illness | |||||
---|---|---|---|---|---|
≤ 20 | > 20 | OR | 95% CI | ||
S1 | Controls | 538 | 84 | ||
Cases | 479 | 168 | 2.25 | 1.67–3.04 | |
S2 | Controls | 609 | 13 | ||
Cases | 615 | 32 | 2.44 | 1.23–5.11 | |
S3 | Controls | 609 | 13 | ||
Cases | 639 | 8 | 0.59 | 0.21–1.54 | |
≤ 10 | > 10 | ||||
S4 | Controls | 348 | 274 | ||
Cases | 283 | 364 | 1.63 | 1.3–2.05 | |
S5 | Controls | 538 | 84 | ||
Cases | 479 | 168 | 2.25 | 1.67–3.04 | |
S6 | Controls | 538 | 84 | ||
Cases | 581 | 66 | 0.73 | 0.51–1.04 |