Table 2.

Pretest and posttest scores for intervention and comparison groups.

Measure	Pretest				Posttest
	Total	Intervention	Comparison	t	Total	Intervention	Comparison	t
PPVT-4
N	249	136	113	0.05, p = 0.957	234	129	105	0.53, p = 0.599
M	63.81	63.86	63.75		72.70	73.16	72.13
SD	15.42	14.76	16.24		14.63	14.12	15.29
EVT-2
N	238	132	106	0.17, p = 0.864	232	127	105	−0.30, p = 0.762
M	55.63	55.87	55.33		64.08	63.65	64.60
SD	24.01	23.59	24.64		24.01	25.09	22.75

PPVT-4, Peabody Picture Vocabulary Test (4th ed.); EVT-2, Expressive Vocabulary Test (2nd ed.).