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Table 2 Sample collection characteristics as multivariate predictors of gene expression.

From: Placental biomarkers of phthalate effects on mRNA transcription: application in epidemiologic research

  CYP19/18S (square root) PPARγ/18S (log)
Mean (SD) by placenta -0.34 (1.1) -4.70 (1.4)
Characteristic β coefficient (SE) p-value
Delivery method
   Vaginal vs. c-section 0.28 (0.39) p = 0.50 0.52 (0.31) p = 0.15
Time Elapsed since delivery up to 30 minutes (<= 10 minutes is referent)
   11 – 20 minutes -0.82 (0.39) p = 0.08 -1.24 (0.32) p = 0.008
   21 – 30 minutes -1.99 (0.30) p = 0.0005 -2.12 (0.40) p = 0.002
   p-value for trend 0.009 0.002
Regional differences
   Inner vs. outer 0.04 (0.15) p = 0.77 0.20 (0.18) p = 0.26