Effect of number of pesticides used on NHL incidence*
| Exposed [n (%)] | ||||
|---|---|---|---|---|
| Number of pesticides used | Cases (n=650) | Controls (n=1933) | Logistic regression OR (95% CL)† | Hierarchical regression OR (95% CL) |
| *Each estimate is adjusted for use of all pesticides listed in table 3, age, and study site. | ||||
| †Odds ratios (OR) and 95% confidence limits (CL). | ||||
| Any pesticide | ||||
| 0 | 370 | 1252 | 1.0 | 1.0 |
| 1 | 89 (13.7%) | 230 (11.9%) | 1.2 (0.8 to 1.8) | 1.1 (0.9 to 1.7) |
| 2–4 | 87 (13.4%) | 221 (11.4%) | 1.0 (0.6 to 1.6) | 1.0 (0.7 to 1.5) |
| ⩾5 | 104 (16.0%) | 230 (11.9%) | 0.8 (0.4 to 1.9) | 1.0 (0.5 to 1.8) |
| Any insecticide | ||||
| 0 | 382 | 1292 | 1.0 | 1.0 |
| 1 | 114 (17.5%) | 281 (14.5%) | 1.3 (0.9 to 1.9) | 1.2 (0.9 to 1.7) |
| 2–4 | 86 (13.2%) | 237 (12.3%) | 1.0 (0.5 to 1.8) | 0.9 (0.6 to 1.4) |
| ⩾5 | 68 (10.5%) | 123 (6.4%) | 1.9 (0.6 to 5.7) | 1.4 (0.7 to 2.9) |
| Any herbicide | ||||
| 0 | 489 | 1544 | 1.0 | 1.0 |
| 1 | 50 (7.7%) | 132 (6.8%) | 1.0 (0.6 to 1.9) | 1.1 (0.7 to 1.7) |
| 2–4 | 52 (8.0%) | 132 (6.8%) | 0.8 (0.4 to 1.9) | 1.0 (0.6 to 1.6) |
| ⩾5 | 59 (9.1%) | 125 (6.5%) | 0.8 (0.2 to 3.3) | 1.0 (0.5 to 2.2) |
| “Potentially carcinogenic” pesticides | ||||
| 0 | 496 | 1632 | 1.0 | 1.0 |
| 1 | 74 (11.4%) | 168 (8.7%) | 1.6 (0.8 to 3.1) | 1.1 (0.8 to 1.7) |
| 2–4 | 68 (10.5%) | 123 (6.4%) | 2.7 (0.7 to 10.8) | 1.3 (0.7 to 2.3) |
| ⩾5 | 12 (1.8%) | 10 (0.5%) | 25.9 (1.5 to 450.2) | 2.0 (0.8 to 5.2) |