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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