Appendix Table A-2.

Comparison of Samples, Pre- and Post-matching

		Mean		Bias		T-Test
	Sample	Treated	Control	%	% Reduction	T	P>T
Height-for-Age Z	Unmatched	−1.33	−1.34	1.20		0.15	0.88
	Matched	−1.36	−1.50	11.50	−899.40	0.82	0.41
Weight-for-Age Z	Unmatched	−1.38	−1.19	−16.90		−2.25	0.03
	Matched	−1.49	−1.50	1.00	93.80	0.08	0.94
Wealth Quintile=2	Unmatched	0.30	0.20	22.60		3.41	0.00
	Matched	0.27	0.30	−8.00	64.50	−0.55	0.58
Wealth Quintile=3	Unmatched	0.16	0.20	−11.60		−1.59	0.11
	Matched	0.16	0.17	−0.70	94.30	−0.05	0.96
Wealth Quintile=4	Unmatched	0.09	0.21	−34.00		−4.26	0.00
	Matched	0.09	0.08	0.70	98.00	0.06	0.95
Wealth Quintile=5	Unmatched	0.07	0.21	−39.50		−4.83	0.00
	Matched	0.09	0.07	4.70	88.20	0.42	0.67
Mother's Education (Years)	Unmatched	3.37	4.35	−27.70		−4.09	0.00
	Matched	3.57	3.52	1.30	95.20	0.10	0.92
Father's Education (Years) Indicator, Father Passed Away	Unmatched	6.12	7.05	−25.60		−3.73	0.00
	Matched	5.91	5.91	0.20	99.10	0.02	0.99
	Unmatched	0.01	0.02	−6.90		−0.87	0.38
	Matched	0.02	0.02	−0.90	87.00	−0.05	0.96
Prior Cognitive Test (2000)	Unmatched	13.70	17.90	−41.70		−4.72	0.00
	Matched	13.47	13.80	−3.30	92.00	−0.25	0.80
Prior Math Achievement	Unmatched	68.86	71.60	−17.60		−1.93	0.05
	Matched	68.49	68.70	−1.40	92.20	−0.09	0.93
Prior Language Achievement	Unmatched	68.46	73.34	−29.50		−3.27	0.00
	Matched	68.37	68.75	−2.30	92.20	−0.15	0.88
Grade Attained	Unmatched	5.77	6.44	−29.90		−4.33	0.00
	Matched	6.68	6.78	−4.40	85.40	−0.38	0.70
Age	Unmatched	13.59	13.79	−11.30		−1.46	0.14
	Matched	14.39	14.43	−1.90	82.80	−0.23	0.82
Female	Unmatched	0.46	0.45	2.30		0.32	0.75
	Matched	0.50	0.51	−1.90	14.50	−0.14	0.89

Source: Gansu Survey of Children and Families. Note: Indicator for mother passed away dropped due to collinearity.