Skip to main content

Advertisement

Table 4 Summary statistics for PCE exposure indices for female dry cleaning workersa

From: Biological exposure assessment to tetrachloroethylene for workers in the dry cleaning industry

PCE exposure indices Wednesday Thursday Friday Overall
  n M (SD) GM (GSD) n M (SD) GM (GSD) n M (SD) GM (GSD) n M (SD) GM (GSD)
PCE TWA (ppm) 17b 2.41 (3.42) 1.45 (2.73) 18 3.85 (5.35) 1.84 (3.84)     35 3.15 (4.51) 1.64 (3.26)
PCE in blood (ng/ml) pre-shift     15c 70.5 (106.4) 36.7 (3.34)     15 70.5 (106.4) 36.7 (3.34)
PCE in exhaled breath (ppm) pre-shift 15b,d 0.55 (0.38) 0.37 (2.87) 18 0.54 (0.41) 0.39 (2.40) 18 0.45 (0.33) 0.30 (2.82) 51 0.51 (0.37) 0.35 (2.65)
PCE in exhaled breath (ppm) post-shift 16b,d 0.87 (0.56) 0.71 (2.02) 18 1.14 (0.91) 0.71 (3.11) 11e 1.82 (0.93) 1.63 (1.63) 45 1.21 (0.87) 0.87 (2.51)
TCA in urine/creatinine (mg/g) pre-shift     14e 1.13 (1.94) 0.29 (7.23)     14 1.13 (1.94) 0.29 (7.23)
TCA in urine/creatinine (mg/g) post-shift     15e 0.86 (1.08) 0.37 (4.89) 9e,f 1.06 (0.93) 0.86 (1.86) 24 0.94 (1.01) 0.51 (3.89)
  1. Abbreviations: n, number of samples/specimens; M, arithmetic mean; SD, standard deviation; GM, geometric mean; GSD, geometric standard deviation
  2. a For the referent laundry workers PCE TWA (nondetectable) and blood (two orders of magnitude lower than the dry cleaners) were reported in Toraason et al. 2003 [36]
  3. b One worker not available for sampling on Wednesday
  4. c Three blood specimen results did not satisfy laboratory quality control criteria and were excluded prior to analysis.
  5. d Exhaled breath samples were lost due to sample handling.
  6. e Samples contained creatinine concentrations outside the 0.3 – 3 g/L range and were excluded prior to analysis.
  7. f Two individuals worked alternate schedules and were not sampled on this day.