Effect of Socioeconomic Status of Biological and Adoptive Parents on WISC-R Subtest Scores of their French Adopted Children

Analyses from an a priori full cross-fostering study (Capron & Duyme, 1989, 1991), investigating the IQs of 38 children whose average age was 168 (SE = 3.28) months, indicated a link between the socioeconomic status @ES) of both biological and adoptive parents and Full, Verbal, and Performance IQs of the WISC-R scale. Here detailed analyses of the WISC-R scale are presented. These show that these two factors affect Block Design and Information subtests, and other subtests are affected either by one or the other factor. Two subtests-Picture Arrangement and Picture Completion-are not affected by either factor. There is no evidence for an interaction between these factors on adopted children’s subtest scores. As the sample size is small for a test of nonadditivity, the analysis is extended to the power of interaction test.