Correction

Figures & data

Table 2. Mean and standard deviation of demographic characteristics and prior test scores for all students enrolled in the study schools at the start of the school year and separately for treatment and control group students along with results of tests for group differences.

	All (N = 3,035)		Treatment (N = 1,689)		Control (N = 1,346)		Difference (T-C)
Variables	Mean	(SD)	Mean	(SD)	Mean	(SD)
Male	0.50	0.50	0.51	0.50	0.48	0.50	0.03
IEP status	0.13	0.34	0.13	0.34	0.13	0.34	0
Free/reduced-priced lunch status	0.39	0.49	0.37	0.48	0.42	0.49	–0.05**
Ethnic minority^a	0.08	0.27	0.07	0.25	0.10	0.30	–0.03**
Grade 6 Math (scaled score)^b	644.25	11.20	644.59	10.78	643.83	11.71	0.76
Grade 6 Math (percentile)	54.03	27.40	54.74	26.87	53.13	28.03	1.61
Grade 6 Reading (scaled score)	648.10	11.60	647.94	11.25	648.30	12.04	–0.36
Grade 6 Reading (percentile)	54.99	27.74	54.60	27.48	55.49	28.07	–0.89

Notes: ^aEthnic Minority includes Asians, Blacks and Latinos with Asians representing 25% of the nonwhite sample.

^bNew England Common Assessment Program.

**p < 0.01.