Exposure | Cases | Person-year | Incidence (/1000) | IRR* (95% CI) |
---|---|---|---|---|
*IRRs in the models are adjusted for calendar year (1970–80, 1981–90, and 1991–96), hay-fever (no/yes), smoker (never/ever), and region (south/middle-north); †spraying, test for trend p=0.23; ‡bleaching, test for trend p=0.31. | ||||
Model I: | ||||
Spraying (treatments/week): | ||||
0–30 | 24 | 7 807 | 3.1 | 1.0 (—) |
31–50 | 38 | 10 457 | 3.6 | 1.1 (0.7 to 1.8) |
≥51 | 31 | 6 619 | 4.7 | 1.4† (0.8 to 2.4) |
Model II: | ||||
Bleaching (treatments/week): | ||||
0–1 | 30 | 8 816 | 3.4 | 1.0 (—) |
2–7 | 57 | 14 419 | 4.0 | 1.1 (0.7 to 1.8) |
≥ 8 | 10 | 2 105 | 4.7 | 1.5‡ (0.7 to 3.0) |