From: Biological exposure assessment to tetrachloroethylene for workers in the dry cleaning industry
Parameter | Weekend | Post-shift Friday | Pre-shift Monday | Percent Changea | |||
---|---|---|---|---|---|---|---|
 |  | n | GM (Range) | n | GM (Range) | n | Median |
PCE in exhaled breath (ppm) | 1 | 12 | 1.48 (0.43 – 3.83) | 13 | 0.66 (0.08 – 1.55) | 12 | -46% |
 | 2 | 13 | 1.05 (0.22 – 4.42) | 12 | 0.54 (0.17 – 0.97) | 12 | -53% |
 | 3 | 13 | 1.83 (0.87 – 5.80) | 11 | 0.34 (0.08 – 1.91) | 11 | -80% |
 | Overall | 38 | 1.42 (0.22 – 5.80) | 36 | 0.50 (0.08 – 1.91) | 35 | -58% |
TCA in urine/creatinine (mg/g) | 1 | 10 | 0.44 (0.03 – 2.24) | 10 | 0.47 (0.05 – 6.24) | 8 | -25% |
 | 2 | 11 | 0.72 (0.31 – 4.61) | 11 | 0.51 (0.19 – 2.83) | 10 | -3% |
 | 3 | 9 | 0.77 (0.31 – 1.64) | 10 | 0.35 (0.02 – 0.90) | 7 | -38% |
 | Overall | 30 | 0.62 (0.03 – 4.61) | 31 | 0.44 (0.02 – 6.24) | 25 | -29% |