Table 2 Exposure to polycyclic aromatic hydrocarbons (no lag) among persons employed only in asphalt paving and incidence of bladder cancer; all Poisson regression models adjusted for age, calendar period, total duration of employment and country.
| Exposure metric (units) | Exposure group | n* | Person‐years† | RR estimates (95% CI) |
|---|---|---|---|---|
| Average | 0<–<65 | 12 | 79760 | 1.00 |
| (ng benzo(a)pyrene/m3) | 65–<126 | 11 | 37367 | 1.01 (0.43 to 2.39) |
| 126–<198 | 12 | 17742 | 1.41 (0.55 to 3.60) | |
| 198+ | 13 | 16290 | 1.36 (0.54 to 3.44) | |
| p trend = 0.4 | ||||
| Cumulative | 0<–<253 | 12 | 70658 | 1.00 |
| (ng benzo(a)pyrene/m3–years) | 253–<895 | 12 | 47851 | 0.69 (0.29 to 1.63) |
| 895–<1665 | 12 | 15828 | 1.21 (0.45 to 3.25) | |
| 1665+ | 12 | 16822 | 0.84 (0.24 to 2.94) | |
| p trend = 0.9 |
*Number of incident bladder cancers.