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Table 5 Pearson correlation coefficients for selected monitoring parametersa in week 1

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

    Wednesday Thursday Friday
    Preshift Shift Postshift Preshift Shift Postshift Preshift Postshift
    Breath TWA Breath Breath Urine Blood TWA Breath Urine Breath Breath Urine
Wednesday Preshift Breath 1   0.58* 0.49 0.05 0.46   0.54* 0.74** 0.59* -0.04 0.42
  Shift TWA   1 0.81*** 0.72** 0.33 0.84*** 0.83*** 0.66** 0.71** 0.59* 0.37 0.72*
  Postshift Breath    1 0.79*** -0.07 0.88***   0.65** 0.59* 0.70** 0.31 0.72*
Thursday Preshift Breath     1 0.14 0.72**   0.86*** 0.62* 0.90*** 0.40 0.43
   Urine      1 0.37       
   Blood       1       
  Shift TWA        1 0.72*** 0.71** 0.54* 0.84** 0.36
  Postshift Breath         1 0.61* 0.90*** 0.65* -0.17
   Urine          1    
Friday Preshift Breath           1 0.39 -0.10
  Postshift Breath            1 0.20
   Urine             1
  1. a The following variables were log transformed: TWA (PCE TWA), Blood (PCE in blood), and Urine (creatinine-adjusted TCA in urine). Breath levels were compared throughout the test period. Urine metabolites were compared to previous or contemporaneous breath samples and TWAs. Blood levels were compared to previous or contemporaneous breath samples, urine specimens, and TWA.
  2. * P-value < 0.05
  3. ** P-value < 0.01
  4. *** P-value < 0.001