Exact(2)
We found no association within worker groups between pesticide and metabolite concentrations and self-reported information about the recent application of pesticides in the workplace.
This study does not rule out the possibility that specific biomechanical exposures in some types of computer work may increase the risk for CTS, especially within worker groups without exposure to any other hand-intensive work.
Similar(58)
In addition, repeated exposure measurements on the same worker were collected at random intervals to allow estimation of the between- and within- worker variances.
For all exposure metrics, the within-worker variability (GSDW 2.1 5.6) was greater than the between-worker variability (GSDB 1.2 2.7).
We assume that the exposures are log-normally distributed, and that they can be adequately modeled by a mixed effects regression model with parameters for exposure levels and for between- and within-worker variance components.
Here, we advocate testing an assumption of homogeneous within-worker variance components, σ2w,h, using a likelihood ratio test to choose between a full model (distinct σ2w,h for each group) and a reduced model (common σ2w across groups).
For these data, the testing procedure generally resulted in the same conclusion regarding overexposure under both models, even in those data sets where the within-worker variance components appeared to be quite heterogeneous.
The within-worker SD was assumed to be half the size of the between-worker SD (0.34).
The within-worker variance was higher than the between-worker variance in both job categories in the present study.
The relatively small within-worker differences in daily urinary TCPy levels throughout the study suggest that these workers were approaching a steady-state exposure to CPF.
The within-worker variance was also higher than the between-worker variance in both production workers and cleaners when stratified by section (Table 1).
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