Table IV.

Infant health production models: marginal effects of inputs and TUVs on infant health outcomes

	Birth weight (g) (1)	Low birth weight (<2500 g) (2)	Abnormal infant health condition (3)
Prenatal illicit drug use	−139.26**	0.04**	0.06***
Prenatal cigarette smoking	−173.56***	0.05***	0.00
First trimester prenatal care	17.61	0.00	−0.01
Considered abortion	23.35	−0.00	0.02
STD during pregnancy	−2.81	0.02	0.03***
Pre-existing lung disease	−27.31	0.03**	0.01
Other pre-existing health condition	−45.43	0.04**	−0.01
Pre-pregnancy underweight	−108.67**	0.04	−0.04
Pre-pregnancy morbidly obese	64.47	−0.01	−0.03
History of mental illness	−28.54	0.04**	0.01
Mean	3221	0.10	0.12
N	3122	3124	3101

^***Significant at 1% level

^**5% level

^*10% level (based on robust standard errors). TUV, typically unobserved variable. Birth weight model is estimated using ordinary least squares. Low birth weight and abnormal conditions are estimated using probit models; the marginal effects are presented. Models include all variables from Table II plus indicators for the city in which the birth took place.