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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
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Environmental Health

ISSN: 1476-069X