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. Author manuscript; available in PMC: 2012 Apr 10.
Published in final edited form as: J Learn Disabil. 2008 Mar-Apr;41(2):126–142. doi: 10.1177/0022219407313426

Table 3.

Peabody Picture Vocabulary Test–Revised Standard Mean Scores

Group M SD t p
Study 1
    Research intervention (n = 21) 85.10 10.93 0.619 .539
    No research intervention (n = 29) 83.38 8.67
Study 2
    Research intervention (n = 14) 78.71 11.26 2.18 .036
    No research intervention (n = 22) 87.86 12.89