Table 2

Descriptive Statistics and Balance Test for T2 and T3 Sample

	Post-intervention T2					Follow-up T3
	Control	Treat	Difference	Wild P	N	Control	Treat	Difference	Wild P	N
T1 summary score	0.022	−0.021	−0.056	0.501	650	0.028	−0.016	−0.064	0.454	661
	(0.058)	(0.053)	(0.083)			(0.059)	(0.052)	(0.083)
T1 executive functioning	−0.015	0.009	0.024	0.799	650	−0.022	0.019	0.040	0.669	661
	(0.059)	(0.053)	(0.090)			(0.058)	(0.052)	(0.093)
T1 language	0.058	−0.046	−0.112	0.190	650	0.076	−0.050	−0.147^*	0.072	661
	(0.059)	(0.052)	(0.084)			(0.060)	(0.050)	(0.076)
T1 mathematics	0.010	−0.013	−0.046	0.573	650	0.014	−0.008	−0.047	0.578	661
	(0.056)	(0.055)	(0.079)			(0.055)	(0.053)	(0.084)
Female	0.517	0.480	−0.023	0.469	650	0.515	0.475	−0.029	0.435	661
	(0.500)	(0.500)	(0.032)			(0.500)	(0.500)	(0.037)
Birth month	6.878	6.807	−0.076	0.748	650	6.744	6.826	0.063	0.813	661
	(3.184)	(3.213)	(0.235)			(3.229)	(3.177)	(0.266)
Mother education	14.377	14.161	−0.169	0.464	626	14.385	14.126	−0.230	0.268	637
	(2.590)	(2.587)	(0.230)			(2.547)	(2.569)	(0.207)
Father education	13.814	13.696	−0.136	0.658	620	13.782	13.715	−0.085	0.776	628
	(2.563)	(2.504)	(0.265)			(2.536)	(2.469)	(0.252)
Mother earnings	341,408	320,168	−22,902	0.324	648	339,897	322,267	−21,206	0.329	658
	(221,464)	(206,324)	(22,751)			(214,889)	(203,739)	(21,584)
Father earnings	544,773	558,596	14,311	0.512	636	547,552	562,885	18,007	0.415	643
	(259,182)	(267,057)	(21,544)			(262,667)	(272,631)	(21,599)
Non-Western immigrant	0.130	0.201	0.068	0.123	650	0.136	0.203	0.064	0.142	661
	(0.337)	(0.401)	(0.040)			(0.343)	(0.403)	(0.039)
Missing T1 test scores	0.051	0.034	0.015	0.437	650	0.058	0.041	0.016	0.518	661
	(0.013)	(0.010)	(0.019)			(0.014)	(0.010)	(0.024)
N	292	358	650			293	368	661
F-test			0.295					0.000

Notes: ^*p < 0.1. The columns provide mean (standard deviation) for covariates and T1 test scores for the control group and treatment group in the T2 and T3 analytic samples. The column labeled “Difference” is the estimated coefficient (standard error) from regressing each covariate against treatment status. Regressions are clustered on and control for randomization block.