Table 2.

IQ Scores and Mean Scores (Standard Deviations in Parentheses) on the Wechsler Intelligence Scale for Children-Revised (WISC-R) for Preterm Children With a Birth Weight <1750 g and Their Matched Controls. Significance of the Differences Between the Preterm and Control Children Analyzed With the Wilcoxon Rank Sum Test for Matched Pairs

Test/SubtestPreterm Children (n = 42) Control Children (n = 42) P Value
IQ SS*RSIQSSRSIQ/SSRS
Mean (SD)Mean (SD)Mean (SD)Mean (SD)Mean (SD) Mean (SD)
Full scale97.5 (14.7)95.4 (16.7)103.8 (10.2)105.8 (13.8).03.009
Verbal95.4 (11.7)47.1 (8.9)100.2 (11.3)50.5 (9.2).04.07
Information7.3 (2.8)9.3 (2.6)8.0 (3.0)9.9 (2.9).22.27
Similarities9.7 (2.6)9.9 (2.7)9.8 (2.2)10.0 (2.5).73.75
Arithmetic10.4 (2.0)10.0 (1.3)11.6 (2.3)11.0 (1.6).01.004
Comprehension10.2 (2.6)16.5 (4.0)10.7 (2.2)17.2 (3.4).44.65
Digit span9.3 (2.1)8.9 (2.1)9.9 (2.6)9.3 (2.2).51.71
Performance97.5 (12.6)48.5 (9.2)107.1 (10.5)55.3 (7.4).001.001
Picture completion9.1 (2.1)16.0 (2.4)11.2 (4.8)17.5 (2.1).002.004
Picture arrangement10.6 (2.8)24.1 (7.5)11.9 (3.3)27.4 (8.1).14.16
Block design9.4 (2.6)25.3 (9.4)11.1 (2.3)30.2 (9.5).01.06
Object assembly10.2 (3.2)19.9 (4.8)11.4 (2.7)22.1 (4.1).09.04
Coding9.1 (3.0)30.2 (6.9)10.5 (2.6)34.4 (8.6).02.008
  • * SS, standard scores.

  • RS, raw scores.