Table 3.

Associations of SES with SGA among 8737 primiparae in Wuhan, China

SGA	SES	OR	95% CI	P values
Model 1	Low	Ref
	High	0.770	0.669 to 0.886	<0.001
Model 2	Low	Ref
	High	0.846	0.728 to 0.983	0.029
Model 3	Low	Ref
	High	0.856	0.737 to 0.995	0.043

Model 1, unadjusted model; model 2, adjusted for maternal age, prepregnancy body mass index, gestational weight gain, a multivitamin supplement during the first trimester of pregnancy, sleep quality in the month before the birth, physical activity during last trimester and passive smoking during pregnancy; model 3 adjusted as model 2 plus pregnancy-induced hypertension syndrome.

SES, socioeconomic status; SGA, small-for-gestational-age.