Standardised incidence ratios (SIRs) for all cancer for employees with potential alachlor exposure (workplace or drinking water)
| Years of exposure/years since first exposure | Subjects* | Person-years | O/E† cases | SIR | 95% CI |
|---|---|---|---|---|---|
| *Numbers of workers not mutually exclusive across groups, though person-years are. | |||||
| †Observed number of cases/expected number of cases. | |||||
| ‡One worker moved into the Iowa study area after achieving either five years’ exposure or 15 years since first exposure. | |||||
| §Refers to years of high exposure and years since first high exposure. | |||||
| All alachlor exposed workers | |||||
| <5 years/<15 years | 1152 | 7081 | 9/5.8 | 156 | 71 to 297 |
| <5 years/15+ years | 260 | 2010 | 6/4.9 | 124 | 45 to 269 |
| 5+ years/<15 years | 519 | 4350 | 5/4.9 | 102 | 33 to 237 |
| 5+ years/15+ years | 433 | 4441 | 16/12.8 | 125 | 72 to 203 |
| Total‡ | 1153 | 17882 | 36/28.3 | 127 | 89 to 176 |
| Workers with high alachlor exposure | |||||
| <5 years/<15 years§ | 699 | 6697 | 6/5.8 | 104 | 38 to 226 |
| <5 years/15+ years | 387 | 3747 | 12/9.1 | 132 | 68 to 230 |
| 5+ years/<15 years | 158 | 1454 | 3/1.6 | 183 | 38 to 534 |
| 5+ years/15+ years | 142 | 1994 | 8/7.1 | 113 | 49 to 224 |
| Totalc | 700 | 13891 | 29/23.6 | 123 | 82 to 177 |