Regression coefficients and 95% confidence intervals of multiple linear regression model of birth outcomes by perfluorinated compounds in cord blood.

Abbreviations: PFNA, perfluorononanoic acid; PFOA, perfluorooctanoic acid; PFOS, perfluorooctyl sulfonate; PFUA, perfluoroundecanoic acid.
*P<0.05; **P<0.01; ***P<0.001 (P value are 2 sided).
aFor PFOA, PFNA and PFUA, concentration value below LOQ were set to be 1/2 LOQ.
bModel adjusted for maternal age, prepregnancy body mass index, education level, log (Ln)-transformed cord blood cotinine levels, type of delivery, parity and infant sex and gestational age for birth weight, birth length, head circumference, and Ponderal index.
cPonderal index: birth weight in grams divide by third power of body length in centimeters, then multiplied by 100.