Table 3.

Low birth weight and the selected covariates.

Covariates	Odds Ratio		Regression Coefficient
	Low Birth Weight		Birth Weight (g)
	All Births	> 37 weeks	All Births	> 37 weeks
Medical risk category	1.945***	1.435***	−65.19***	−5.839***
	(±−0.06)	(±−0.08)	(±−4.25)	(±−3.74)
Race category (1=non Hispanic black	1.860***	1.893***	−156.0***	−122.4***
	(±−0.08)	(±−0.12)	(±−6.35)	(±−5.68)
Smoking (0=no, 1=yes)	1.740***	2.136***	−168.9***	−152.6***
	(±−0.08)	(±−0.14)	(±−7.92)	(±−7.08)
Kessner Index (0=adequate, 1=inadequate)	1.287***	1.185***	−55.33***	−36.11***
	(±−0.04)	(±−0.06)	(±−4.27)	(±−3.76)
Marital Status	1.250***	1.275***	−49.97***	−40.85***
	(±−0.04)	(±−0.08)	(±−4.96)	(±−4.61)
Age Groups (1–4; coded in ascending order)	1.051***	1.025	31.71***	40.50***
	(±−0.02)	(±−0.04)	(±−2.86)	(±−2.45)
Mother’s Education (coded in ascending order)	0.953***	0.915***	11.21***	10.59***
	(±−0.02)	(±−0.02)	(±−2.12)	(±−1.96)
Alcohol Consumption (0=no, 1=yes)	1.230***	1.265**	−44.72***	−26.43*
	(±−0.18)	(±−0.25)	(±−30.91)	(±−26.95)
ln(% households receiving public assistance in the census tract of mother’s residence)	1.058***	1.077***	−13.79***	−12.72***
	(±−0.02)	(±−0.04)	(±−2.90)	(±−2.69)
City code (0=Chicago, 1=Outside Chicago)	1.078***	1.103***	−16.27***	−12.23***
	(±−0.04)	(±−0.06)	(±−5.94)	(±−5.55)
Constant	0.0295***	0.0141***	3342***	3352***
	(±0.00)	(±0.00)	(±−9.72)	(±−8.72)
Observations	381,905	352,667	381,905	352,667
R-squared	NA	NA	0.0615	0.0565

^***p<0.01,

^**p<0.05,

^*p<0.1 (95% confidence interval in parentheses); NA = not applicable