Table 1.

A comparison of included and excluded samples for analysis from the CSRP

	Intervention Group		Control Group
	Included (n = 181)	Excluded (n = 127)	Included (n = 180)	Excluded (n = 114)
Child Covariates
Boy	0.52 (0.50)	0.48 (0.50)	0.46 (0.50)	0.38 (0.49)
Age	4.23 (0.84)	4.14 (0.69)	4.45 (0.80)	3.88 (0.87)**
Non-Hispanic Black	0.75 (0.43)	0.54 (0.50)**	0.63 (0.48)	0.68 (0.47)
Pre-intervention score
PPVT-III	0.47 (0.16)	0.42 (0.14)*	0.46 (0.18)	0.38 (0.16)**
Early Math Skills	0.43 (0.18)	0.35 (0.19)**	0.42 (0.21)	0.29 (0.20)**
BPI Internalizing Problems	2.33 (2.54)	2.74 (2.40)	1.56 (2.09)	2.79 (2.74)**
BPI Externalizing Problems	6.33 (6.31)	5.94 (5.63)	4.01 (4.46)	7.65 (6.21)**
Baseline Mother Covariates
Mother was married	0.20 (0.40)	0.14 (0.34)	0.28 (0.45)	0.20 (0.40)
Less than high school education	0.31 (0.46)	0.19 (0.39)*	0.26 (0.44)	0.24 (0.43)
Working ≤ 10 hours per week	0.48 (0.50)	0.34 (0.47)*	0.40 (0.49)	0.38 (0.49)
Income below 50% poverty line	0.52 (0.50)	0.39 (0.49)*	0.43 (0.50)	0.36 (0.48)
Baseline Classroom Covariates
Overall quality	4.34 (0.75)	4.62 (0.70)**	4.93 (0.70)	5.04 (0.82)
Emotional climate	15.16 (2.94)	15.75 (2.62)+	16.47 (2.55)	17.15 (2.55)*
Teacher behavior management skills	4.59 (1.06)	4.57 (1.09)	5.09 (0.87)	5.27 (0.93)+
Student-staff ratio	6.95 (1.38)	6.84 (1.43)	7.38 (1.82)	7.48 (1.90)

Notes: means and standard deviations in parentheses;

^**p < 0.01,

^*p < 0.05,

⁺p < 0.10 for two-tailed t-statistics testing the mean differences between the sample included in the analysis and the sample excluded from the analysis by intervention status, with significance levels, if any, indicated in the descriptive statistics of the excluded sample.