Age at first exposure (y): | | | | | 0.33 | | | 0.52 |
<25 | 3619 | 118081 | 15 | 12.70 | Reference | | | Reference | |
25–34 | 4173 | 136243 | 22 | 16.15 | 1.3 (0.7 to 2.5) | | | 1.2 (0.6 to 2.3) | |
⩾35 | 2317 | 62221 | 11 | 17.68 | 1.8 (0.8 to 4.0) | | | 1.6 (0.7 to 3.5) | |
Duration of exposure (y): | | | | | <0.0001 | | | <0.001 |
<5 | 4774 | 136200 | 3 | 2.20 | Reference | | | Reference | |
5–9 | 2383 | 71806 | 6 | 8.36 | 3.7 (0.9 to 15.0) | | | 3.7 (0.9 to 14.7) | |
10–19 | 1992 | 69015 | 26 | 37.67 | 14.7 (4.4 to 48.8) | | | 15.9 (4.6 to 54.8) | |
⩾20 | 960 | 39524 | 13 | 32.89 | 11.0 (3.1 to 38.9) | | | 9.7 (2.6 to 36.4) | |
Year of first exposure: | | | | | | 0.04 | | | 0.21 |
<1950 | 2425 | 92645 | 25 | 26.98 | Reference | | | Reference | |
1950–59 | 2806 | 98729 | 16 | 16.21 | 0.7 (0.3 to 1.3) | | | 0.5 (0.3 to 1.1) | |
1960–72 | 4878 | 125171 | 7 | 5.59 | 0.3 (0.1 to 0.8) | | | 0.8 (0.3 to 2.1) | |