Likelihood of ET @ vs. @-@ , FHB > @ vs. @ , and risks of preterm birth ( PTB , < @weeks ' gestation ) , low birth weight ( LBW , < @,@ g ) , and small-for-gestational-age birth weight ( SGA , < @th percentile ) with FHB > @ were modeled with binary logistic regression using a backward-stepping algorithm , and presented as adjusted odds ratios ( @ % confidence intervals ) .