Table 4.

Within-Stratum Differences in Reading and Mathematics Skills between Special Education and Non-Special Education Students

Stratum	Special Education Students			Non-Special Education Students			Effect Size (d)
	N	M	SD	N	M	SD
	2004 Reading Test Score
1	18	160.68	11.06	2873	153.91	15.72	0.43
2	19	145.99	21.87	996	142.62	17.50	0.19
3	30	134.19	16.74	889	140.12	18.43	−0.32
4	51	123.22	20.79	624	133.37	20.34	−0.50
5	83	123.75	21.87	371	129.15	20.91	−0.26
6	94	118.05	22.92	169	123.70	22.07	−0.26
7	47	112.71	17.54	29	117.94	24.38	−0.21
8	21	94.02	23.49	4	80.49	4.97	2.72
	2002–2004 Reading Test Score Gains
1	18	21.13	11.82	2873	19.25	11.44	0.16
2	19	21.99	15.84	996	20.69	12.35	0.11
3	30	23.25	15.78	889	21.40	12.54	0.15
4	51	20.49	13.98	624	22.37	13.13	−0.14
5	83	24.40	11.67	371	23.63	14.13	0.05
6	94	24.22	14.68	169	24.01	13.25	0.02
7	47	25.83	13.91	29	20.26	12.19	0.46
8	21	19.47	19.17	4	18.12	4.11	0.33
	2004 Math Test Score
1	18	131.91	11.08	2873	125.11	14.83	0.46
2	19	119.84	17.10	996	116.58	18.09	0.18
3	30	112.47	18.18	889	114.07	18.07	−0.09
4	51	104.81	21.77	624	109.29	20.40	−0.22
5	83	102.83	20.96	371	105.08	20.97	−0.11
6	94	98.55	21.70	169	100.17	23.50	−0.07
7	47	87.40	21.89	29	96.94	22.04	−0.43
8	21	80.35	21.91	4	68.39	14.16	0.84
	2002 – 2004 Math Test Score Gains
1	18	20.37	11.32	2873	20.61	9.73	−0.02
2	19	20.82	10.29	996	21.51	10.24	−0.07
3	30	23.44	8.08	889	22.25	10.90	0.11
4	51	22.15	11.23	624	21.89	10.53	0.02
5	83	19.56	11.55	371	21.78	11.62	−0.19
6	94	22.33	11.33	169	21.98	12.42	0.03
7	47	18.99	12.97	29	22.10	12.36	−0.25
8	21	17.98	12.77	4	15.24	9.18	0.30

Note: None of these contrasts were statistically significant at p<.05