Table 2.
Smoking exposures | Cases (n) | HRa (95% CI) | HRb (95% CI) |
---|---|---|---|
Neverc | 43 | 1.00 (ref) | 1.00 (ref) |
Passive | 53 | 1.33 (0.89–2.01) | 1.34 (0.89–2.01) |
Former | 348 | 3.81 (2.77–5.23) | 3.69 (2.68–5.09) |
Current | 1139 | 15.44 (11.37–20.98) | 13.88 (10.18–18.91) |
Ever | 1464 | 7.67 (5.66–10.41) | 6.80 (5.00–9.24) |
Smoking duration in ever smokersd | |||
1–9 | 231 | 4.58 (3.29–6.39) | 4.16 (2.98–5.82) |
10–19 | 203 | 4.24 (3.05–5.91) | 4.22 (3.02–5.90) |
20–29 | 429 | 9.26 (6.75–12.71) | 8.55 (6.20–11.77) |
≥30 | 595 | 18.11 (13.25–24.74) | 16.48 (12.02–22.60) |
P-trende | <0.001 | <0.001 | |
Cigarettes smoked per day in ever smokersd | |||
1–9 | 376 | 4.46 (3.57–5.58) | 4.28 (3.42–5.37) |
10–19 | 767 | 13.16 (10.65–16.28) | 12.17 (9.81–15.10) |
>20 | 125 | 23.07 (17.70–30.06) | 21.66 (16.54–28.37) |
P-trende | <0.001 | <0.001 | |
Pack-years in ever smokersd | |||
1–5 | 199 | 4.01 (2.89–5.57) | 3.81 (2.73–5.31) |
6–15 | 429 | 8.40 (6.13–11.50) | 7.90 (5.74–10.86) |
>15 | 671 | 22.52 (16.53–30.69) | 21.24 (15.52–29.06) |
P-trende | <0.001 | <0.001 | |
Age at smoking initiation in ever smokersd | |||
>20 | 334 | 6.33 (4.84–7.62) | 5.76 (4.55–7.28) |
17–20 | 739 | 9.95 (8.04–12.31) | 9.08 (7.31–11.27) |
≤17 | 315 | 6.07 (4.84–7.61) | 5.70 (4.53–7.17) |
P-trende | <0.001 | <0.001 |
aAdjusted for age.
bAdjusted for age, duration of education and alcohol consumption, all at enrolment.
cNever-active, never-passive smokers as reference group.
dThe sum of cases in each interval in smoking duration, cigarettes day, pack-years and age at smoking initiation does not sum up to the total number of cases in ever smokers because of missing values.
eTest for trend excluding never smokers.