Measuring impact of New Mexico prekindergarten on standardized test scores and high school graduation using propensity score matching

International Journal of Child Care and Education Policy

Table 1 Pre/post-match balance results for analysis of graduation rates

Pre-match	Comparison (N = 25,480)		Treatment (N = 823)		Standardized difference
Covariates	Mean	SD	Mean	SD	Standardized difference
FRL	63.38%	0.48	75.82%	0.43	0.273
ELL	31.03%	0.46	41.19%	0.49	0.213
SPED	14.49%	0.35	9.60%	0.29	0.151
Ethnicity
Asian	1.90%	0.14	0.12%	0.03	0.178
Black	2.36%	0.15	0.85%	0.09	0.120
Caucasian	24.68%	0.43	12.03%	0.33	0.331
Hispanic	60.64%	0.49	65.01%	0.48	0.900
Native American	10.42%	0.31	21.99%	0.41	0.318
Number of High Schools Represented	125		90
Average SMD					0.311

Post-match	Comparison (N = 823)		Treatment (N = 823)		Standardized difference
Covariates	Mean	SD	Mean	SD	Standardized difference
FRL	76.18%	0.43	75.82%	0.43	0.009
ELL	41.19%	0.49	41.19%	0.49	< 0.001
SPED	9.60%	0.29	9.60%	0.29	< 0.001
Ethnicity
Asian	0.12%	0.03	0.12%	0.03	< 0.001
Black	0.61%	0.08	0.85%	0.09	0.029
Caucasian	12.15%	0.33	12.03%	0.33	0.004
Hispanic	64.88%	0.48	65.01%	0.48	0.003
Native American	22.24%	0.42	21.99%	0.41	0.006
Number of High Schools Represented	90		90
Average SMD					0.007

FRL: free or reduced lunch; ELL: English language learner; SPED: special education; SMD: standardized mean difference; SD: standard deviation