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Table 6 Weekend change in PCE in exhaled breath and creatinine-adjusted TCA in urine

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%
  1. Abbreviations: n, number of samples; GM, geometric mean
  2. a Percent change from post-shift Friday to pre-shift Monday is defined as 100% × (Monday – Friday)/Friday