Table 4.
Analyte | Booth type | nb | Nc | Non-detectsd | Summary statistics |
REML estimates (logged data) |
|||
GM | GSD | Range | Within-worker variance | Between-worker variance | |||||
HDI | Downdraft | 31 | 197 | 26 | 2.72 | 5.74 | 0.003–48.0 | 2.23 | 0.67 |
Semi-downdraft | 10 | 60 | 1 | 10.1 | 2.11 | 0.50–65.5 | 0.48 | 0.12 | |
Crossdraft | 10 | 31 | 1 | 9.65 | 5.58 | 0.0007–179 | 0.61 | 5.18 | |
All booths | 47 | 288 | 28 | 4.10 | 5.42 | 0.0007–179 | 1.78 | 0.71 | |
Uretidone | Downdraft | 31 | 197 | 146 | 1.27 | 20.7 | 0.0004–1430 | 4.60 | 1.61 |
Semi-downdraft | 10 | 60 | 18 | 6.96 | 10.7 | 0.02–613 | 0.98 | 6.92 | |
Crossdraft | 10 | 31 | 13 | 5.39 | 21.2 | 0.0007–521 | 2.89 | 10.2 | |
All booths | 47 | 288 | 177 | 2.12 | 20.3 | 0.0004–1430 | 3.79 | 2.90 | |
Biuret | Downdraft | 31 | 197 | 115 | 3.46 | 9.68 | 0.003–798 | 3.20 | 1.70 |
Semi-downdraft | 10 | 60 | 10 | 44.7 | 8.23 | 0.03–734 | 1.15 | 4.45 | |
Crossdraft | 10 | 31 | 5 | 49.4 | 17.1 | 0.004–7720 | 2.20 | 11.0 | |
All booths | 47 | 288 | 130 | 7.85 | 13.3 | 0.003–7720 | 2.78 | 2.95 | |
Isocyanurate | Downdraft | 31 | 197 | 2 | 1210 | 4.94 | 0.09–17800 | 1.98 | 0.59 |
Semi-downdraft | 10 | 60 | 0 | 2160 | 2.08 | 269–8920 | 0.29 | 0.37 | |
Crossdraft | 10 | 31 | 1 | 1600 | 7.98 | 0.46–18700 | 0.64 | 7.52 | |
All booths | 47 | 288 | 3 | 1410 | 4.65 | 0.09–18700 | 1.66 | 0.83 |
GSD, geometric standard deviation; REML, restricted maximum likelihood.
Multiple imputation (n = 10 imputed datasets) was used to impute air-sampling data below detection limits.
Number of workers. A total of four painters painted in more than one booth type; two painted in both crossdraft and semi-downdraft booths, one painted in both crossdraft and downdraft booths, and one painted in both semi-downdraft and downdraft booths.
Number of samples. Represents the TWA recorded for each paint task. Of the 296 measurements, eight were excluded due to sampling pump malfunction.
Number of samples collecting non-detectable levels.