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IQ stability: The relation between child and young adult intelligence test scores in low‐birthweight samples
Author(s) -
Mortensen Erik Lykke,
Andresen Jente,
Kruuse Emil,
Sanders Stephanie A.,
Reinisch June Machover
Publication year - 2003
Publication title -
scandinavian journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 72
eISSN - 1467-9450
pISSN - 0036-5564
DOI - 10.1111/1467-9450.00359
Subject(s) - psychology , wechsler adult intelligence scale , intelligence quotient , wechsler preschool and primary scale of intelligence , developmental psychology , wechsler intelligence scale for children , danish , test (biology) , clinical psychology , psychiatry , cognition , paleontology , linguistics , philosophy , biology
The stability of IQ from childhood to adulthood in low‐birthweight subjects was measured in two independent samples with follow‐up intervals of approximately 14 and 9.5 years. In both samples, intelligence was assessed with the WISC at a mean age of 9.5. Twenty‐six subjects were retested with the WAIS at a mean age of 23.5, and 78 subjects with the BPP (the Danish Military Draft Board Intelligence Test) at the age of 19.1. Both samples obtained childhood and adult test scores below the expected means. For the Wechsler Verbal, Performance and Full‐Scale IQs, the stability quotients were 0.86, 0.86, and 0.89 in the WAIS sample, and the retest correlations for the three IQs with the BPP score were 0.66, 0.65, and 0.74. Thus, the majority of children showed stable patterns of intellectual development from middle childhood to young adulthood.