explored the relationship between the peabody picture vocabulary test-revised ( ppvt-r ) and the peabody individual achievement test ( piat ) , and pretest ppvt-r standard scores administered about 7 months earlier for a sample of 29 mentally retarded children between the ages of 5-5 and 12-7 ( mean = 9-6 , sd = 1-11 ) .
C0027361
individual
C0008059
children