Agreement Between Bayley-III Measurements and WISC-IV Measurements in Typically Developing Children

Research output: Contribution to journalArticle


The study aim was to explore the relationship between a developmental assessment at preschool age and an intelligence quotient (IQ) assessment at school age. One hundred sixty-two children were assessed at 2.5 years with the Bayley Scales of Infant and Toddler Development—Third Edition (Bayley-III) and then at 6.5 years with the Wechsler Intelligence Scale for Children—Fourth Edition (WISC-IV). The Bayley-III Cognitive Index score was the Bayley entity that showed the highest correlation with WISC-IV Full-Scale IQ (FSIQ; r =.41). There was a significant difference between the individual WISC-IV FSIQ and the Bayley-III Cognitive Index scores. Analyses showed an average difference of −4 units and 95% limits of agreement of −18.5 to 26.4 units. A multivariate model identified the Bayley-III Cognitive Index score as the most important predictor for FSIQ and General Ability Index (GAI), respectively, in comparison with demographic factors. The model explained 24% of the total FSIQ variation and 26% of the GAI variation. It was concluded that the Bayley-III measurement was an insufficient predictor of later IQ.


External organisations
  • Skåne University Hospital
  • Umeå University
  • Karolinska University Hospital
  • Karolinska Institutet
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Psychology (excluding Applied Psychology)


  • assessment, developmental assessment, intelligence/cognition, measurement, participants, preschool, scale development/testing, Wechsler tests
Original languageEnglish
Pages (from-to)603-616
JournalJournal of Psychoeducational Assessment
Issue number5
Early online date2018 Jun 1
Publication statusPublished - 2019
Publication categoryResearch