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Table 7 Model summaries for regression models relating PCE in exhaled breath to PCE TWA

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

Model

Intercept

Day

Body mass index

ln (PCE TWA)

≈ R2

Same day post-shift (34 observations on 18 workers)

-0.46 ± 0.53 (0.40)a

-b

0.042 ± 0.018 (0.036)

0.52 ± 0.082 (<0.0001)

61%

Next day pre-shift (35 observations on 18 workers)

-0.42 ± 0.35 (0.25)

0.15 ± 0.051 (0.011)

0.028 ± 0.012 (0.038)

0.15 ± 0.045 (0.0032)

47%

Next day post-shift (28 observations on 18 workers)

-0.36 ± 0.72 (0.62)

-b

0.047 ± 0.025 (0.082)

0.66 ± 0.12 (<0.0001)

63%

  1. R2, the percent of variance explained by the fixed effects in the model, is estimated by 1 – (estimated total variance for full model/estimated total variance for reduced model), where the reduced model contains only the intercept.
  2. a estimate ± standard error (P-value)
  3. b day effect was not significant and was excluded from the model