Table 3.

Regression model for birth weight at term (37 weeks or more)

	Adjusted difference	95% CI	p-value
Gestational age	0.099	0.086 to 0.113	<0.0001
BMI	0.010	0.007 to 0.012	<0.0001
Maternal age	0.005	0.002 to 0.009	0.005
Level of education	0.058	0.028 to 0.88	<0.001
Gestational diabetes	0.066	0.022 to 0.11	0.002
Parity	0.012	0.001to 0.022	0.032
SHS	-0.035	-0.068 to -0.002	0.037

Statistical tests used were student t test, chi-square test, and Fisher exact test.

SHS = Secondhand smoke. BMI = Body mass index.