Table 6

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

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%

Abbreviations: n, number of samples; GM, geometric mean

a Percent change from post-shift Friday to pre-shift Monday is defined as 100% × (Monday – Friday)/Friday

McKernan et al. Environmental Health 2008 7:12   doi:10.1186/1476-069X-7-12