Table 1.

OLS and Sibling Difference Estimates of the Effect of Head Start on Child Outcomes

Outcome	OLS Regression, No Controls	OLS Regression, Extensive Controls	Sibling Difference
PPVT Test Score
White	−5.6* (1.6)	−0.4 (1.4)	5.9* (1.5)
Black	1.0 (1.2)	0.7 (1.1)	0.3 (1.4)
Completed High School
All	−0.08* (0.03)	0.01 (0.03)	0.04 (0.05)
White			0.20* (0.10)
Black			−0.02 (0.07)

Source: Currie and Thomas (1995: Table 4) for PPVT results; Garces et al. (2002: Table 2) for high school completion results.

^*p < .05