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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: Environ Res. 2015 Jan 16;137:268–277. doi: 10.1016/j.envres.2014.10.035

Table 3.

Multivariable regression models examining prenatal PM2.5 in relation to BWGA z-score a

Main Model
 PM2.5 × Male Model
 PM2.5 × Obese Model
 PM2.5×Male×Obese Model
β s.e. P β s.e. P β s.e. P β s.e. P
PM2.5 (per IQR increase)b −0.05 0.08 0.52 0.08 0.10 0.43 −0.03 0.09 0.77 −0.02 0.12 0.89
Male 0.26 0.08 0.002 1.97 0.89 0.03 0.28 0.08 0.001 0.42 1.08 0.70
Maternal BMI
 Normal Ref -- -- Ref -- --
 Overweight 0.16 0.10 0.11 0.17 0.10 0.10
 Obese 0.57 0.93 0.54 −1.32 1.29 0.30
PM2.5 × Male −0.26 0.13 0.05 −0.01 0.16 0.94
PM2.5 × Obese −0.02 0.14 0.91 0.28 0.19 0.14
Male × Obese 4.27 1.85 0.02
PM2.5 × Male × Obese −0.67 0.28 0.02
a

All models were also adjusted for season of birth, maternal race, education, age at enrollment, prenatal smoking, prenatal NLEs, and neighborhood disadvantage index. The β’s denote the effect estimates of the main exposure of interest as well as effect estimates of the interaction terms in each regression model.

b

IQR of PM2.5 level=1.64 μg/m3