Table 3 Exposure to polycyclic aromatic hydrocarbons (15 year 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 | py | RR (95%CI) |
|---|---|---|---|---|
| Average (ng benzo(a)pyrene/m3) | 0<–<99 | 10 | 36948 | 1.00 (–) |
| 99–<139 | 9 | 14739 | 1.53 (0.54 to 4.38) | |
| 139–<204 | 10 | 7358 | 2.71 (1.01 to 7.27) | |
| 204+ | 10 | 9743 | 1.90 (0.66 to 5.47) | |
| p‐trend = 0.15 | ||||
| Cumulative (ng benzo (a)pyrene/m3‐years) | 0<–<385 | 10 | 36674 | 1.00 (–) |
| 385–<883 | 9 | 15634 | 1.13 (0.44 to 2.90) | |
| 883–<1755 | 12 | 9611 | 1.67 (0.62 to 4.48) | |
| 1755+ | 8 | 6869 | 1.09 (0.30 to 3.99) | |
| p‐trend = 0.63 |
N, number of incident bladder cancers; py, person‐years.