Loge (bitumen fume) | Loge (benzo(a)pyrene) | |
---|---|---|
Determinant of exposure§ | β (SE)§§ | β (SE) |
†Reference category is XAD2 sorbent. | ||
‡Reference category includes: 37 mm open face cassette, 25 mm closed face cassette (Millipore) and PAS6. | ||
¶Corresponds to hot mix paving in 1997. | ||
§All variables were categorical 1/0 unless specified otherwise. | ||
**Symbol “×” denotes a multiplicative interaction of variables. | ||
††Variable is not statistically significant and therefore is not included in the model or did not improve model fit on inclusion in the model. | ||
‡‡Not possible to estimate. | ||
¶¶Not applicable. | ||
§§Regression coefficient (β) and its standard error (SE). | ||
‡‡‡Estimated variance of the distribution of logarithmic means of individuals' exposures (between worker). | ||
¶¶¶Estimated variance of the distribution of logarithmic means of exposure from day to day for an individual (within worker). | ||
Mastic laying | 0.88 (0.22) | 1.27 (0.47) |
Mastic laying × worst case (indoors)** | 1.71 (0.29) | 3.07 (0.84) |
Recycling | 0.89 (0.25) | 1.51 (0.28) |
Recycling × worst case** | 1.67 (0.37) | NS |
Surface dressing | NS | 0.38 (0.20) |
Oil gravel | −1.51 (0.28) | −0.65 (0.38) |
Tar use | NS | 1.68 (0.28) |
Years before 1997 | 0.062 (0.008) | 0.107 (0.022) |
Application temperature in non-mastic paving (°C) | NS†† | NS |
Area sample | NS | NS |
Sorbent type† | ||
Silica | NA¶¶ | NS |
Charcoal | NA | NS |
Sampling head‡ | ||
37 mm closed face | −1.32 (0.15) | NS |
GGP | 1.20 (0.16) | NP |
Intercept¶ | −2.09 (0.11) | 0.91 (0.16) |
S2BWy‡‡‡ | 0.99 | 0.43 |
S2WWy¶¶¶ | 1.08 | 1.71 |
Number of observations | 1193 | 487 |