IQ stability: the relation between child and young adult intelligence test scores in low-birthweight samples.
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.
Mortensen
Erik Lykke
EL
Danish Epidemiology Science Center, Institute of Preventive Medicine, Copenhagen Hospital Corporation, Kommunehospitalet, Denmark. el.mortensen@pubhealth.ku.dk
Andresen
Jente
J
Kruuse
Emil
E
Sanders
Stephanie A
SA
Reinisch
June Machover
JM
D000328:Adult; D001835:Body Weight; D002648:Child; D003072:Cognition Disorders / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007360:Intelligence; D008297:Male; D014888:Wechsler Scales