Table 4.

Sibling fixed-effect estimates, using dichotomous measures of birth weight and dichotomous measures of mother's education (>12 years)

	Total Time	Educational Time
	(1)	(2)
A. Full Sample
LBW	–0.13 (0.13)	–0.17 (0.14)
LBW × Mother's education (= 1 if >12 years)	0.28 (0.19)	0.39* (0.19)
N	1,516	1,516
Number of sibling pairs	758	758
B. Both Siblings <6 Years Old
LBW	–0.21 (0.20)	–0.14 (0.16)
LBW × Mother's education (= 1 if >12 years)	0.54* (0.27)	0.40 (0.29)
N	594	594
Number of sibling pairs	298	298
C. Both Siblings ≥6 Years Old
LBW	–0.02 (0.15)	–0.07 (0.53)
LBW × Mother's education (= 1 if >12 years)	0.34 (0.27)	0.32 (0.60)
N	380	380
Number of sibling pairs	190	190

Notes: LBW = low birth weight. Sibling fixed-effect models for the full sample include the following covariates: child's sex, an indicator for whether school aged, an indicator for whether the younger child, mother's age at birth, and an indicator for whether the mother was married at the child's birth. Age-stratified models include all the preceding covariates but exclude an indicator for whether school aged. Robust standard errors are shown in parentheses.

^*p < .05