Childhood acute leukaemia and exposure to high traffic roads (<50 m) according to exposure period
| In utero exposure | Childhood exposure | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cases (n = 280) | Controls (n = 285) | OR | (95% CI) | Cases (n = 280) | Controls (n = 285) | OR | (95% CI) | |||||
| No. | % | No. | % | No. | % | No. | % | |||||
| Heavy traffic road | ||||||||||||
| All road types | 134 | 47.9 | 149 | 52.3 | 0.9 | (0.7 to 1.3) | 155 | 55.4 | 164 | 57.5 | 1.1 | (0.8 to 1.6) |
| Secondary road or main street | 98 | 35.0 | 104 | 36.5 | 1.0 | (0.7 to 1.4) | 114 | 40.7 | 124 | 43.5 | 1.1 | (0.7 to 1.6) |
| Primary road | 19 | 6.8 | 21 | 7.4 | 0.8 | (0.4 to 1.6) | 28 | 10.0 | 21 | 7.3 | 1.1 | (0.6 to 2.2) |
| Motorway or similar road | 11 | 3.9 | 13 | 4.6 | 1.3 | (0.5 to 3.2) | 14 | 5.0 | 17 | 6.0 | 1.3 | (0.6 to 2.9) |