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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