. Author manuscript; available in PMC: 2013 Feb 12.

Published in final edited form as: B E J Econom Anal Policy. 2011 Sep 6;11(3):2521. doi: 10.2202/1935-1682.2521

Table 9.

Birth Weight and Adult Labor Market Outcomes Over the Life Course

	Dependent variables:
	No Earnings. Estimation: Linear Probability Model	ln(earnings), (cond’l on positive earnings, 1997$).	Annual labor market earnings (in $000s, 1997$) Estimation: Tobit model	ln(wage), (cond’l on positive earnings, 1997$).

	(1)	(2)	(3)	(4)

Low birth weight	0.0627^** (0.0247)	−0.1667^* (0.0965)	−4.8191^** (1.8959)	−0.1751^* (0.0967)
(Age - 30)^* Low birth weight	0.0025 (0.0026)	−0.0054 (0.0089)	−0.5310^** (0.2082)	−0.0051 (0.0088)
(Age - 30)²^* Low birth weight	−0.0005^** (0.0002)	0.0015^** (0.0006)	0.0545^*** (0.0162)	0.0014^** (0.0006)
(Age - 30)	0.0049^*** (0.0005)	0.0353^*** (0.0018)	0.9089^*** (0.0618)	0.0353^*** (0.0018)
(Age - 30) squared	0.0002^*** (0.0001)	−0.0011^*** (0.0002)	−0.0195^*** (0.0063)	−0.0011^*** (0.0002)

Implied effect of low birth weight at age:
25	0.0377	−0.1022	−0.8016	−0.1146
35	0.0627	−0.1562	−6.1116	−0.1656

Full or brother sample?	Brother	Brother	Brother	Brother
Brother fixed effects?	Yes	Yes	Yes	Yes
Number of families	680	680	680	672
Number of individuals	1,760	1,743	1,760	1,731
Person-year observations	21354	19830	21354	19,624

Robust standard errors (clustered on individual) in parentheses.

significant at 10%;

^**

significant at 5%;

^***

significant at 1%.

All regression models also include controls for birth order, maternal age at birth, whether born into 2-parent family, race, birth year cohort dummy indicators (5-yr intervals), and parental fertility timing preference variables.