Consequences of using chronological age versus corrected age when testing cognitive and motor development in infancy and intelligence quotient at school age for children born preterm

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dc.contributor.authorGould, J.F.
dc.contributor.authorFuss, B.G.
dc.contributor.authorRoberts, R.M.
dc.contributor.authorCollins, C.T.
dc.contributor.authorMakrides, M.
dc.contributor.editorDuerden, E.
dc.date.issued2021
dc.description.abstractBackground Children born preterm (<37 weeks’ gestation) have an increased risk of poor neurodevelopment, including lower intelligence quotient (IQ) scores compared with their term-born counterparts. Objective To explore the differences in psychometric scores for cognition and motor skills when they are age-standardized according to chronological age instead of corrected age for children born preterm. Methods We assessed = 554 children born <33 weeks’ gestation with the Bayley Scales of Infant Development, 2nd edition (mental and motor scores) at 18 months and the Weschler Abbreviated Scale of Intelligence (IQ score) at seven years of age. Scores were standardized according to chronological age and corrected age and differences between mean chronological and corrected scores were compared, along with the proportion of children whose scores could be classified as impaired. Results When scores were standardized according to chronological age instead of corrected age there was a large significant difference of 17.3 points on the mental scale (79.5 vs. 96.8, respectively) and 11.8 points on the motor scale (84.8 vs. 96.6, respectively) at 18 months. By seven years, the difference in IQ scores remained, although of a smaller magnitude at 1.9 points between mean chronological and corrected age scoring (97.2 vs. 99.1, respectively). Conclusion Consistent with previous literature, outcome assessments for preterm infants consistently differed according to use of chronological or corrected age to standardized scores. Cognitive scores were impacted more severely than motor scores, and differences were more substantial in early childhood than later in childhood. For clinical purposes, correction for preterm birth is only likely to have an impact during early childhood, however assessments for research purposes should continue to correct into childhood to account for the persistent bias due to preterm birth.
dc.description.statementofresponsibilityJacqueline F. Gould, Belinda G. Fuss, Rachel M. Roberts, Carmel T. Collins, Maria Makrides
dc.identifier.citationPLoS ONE, 2021; 16(9):1-12
dc.identifier.doi10.1371/journal.pone.0256824
dc.identifier.issn1932-6203
dc.identifier.issn1932-6203
dc.identifier.orcidGould, J.F. [0000-0003-2810-6870]
dc.identifier.orcidFuss, B.G. [0000-0002-7766-533X]
dc.identifier.orcidRoberts, R.M. [0000-0002-9547-9995]
dc.identifier.orcidCollins, C.T. [0000-0003-3308-9948]
dc.identifier.orcidMakrides, M. [0000-0003-3832-541X]
dc.identifier.urihttps://hdl.handle.net/2440/132957
dc.language.isoen
dc.publisherPublic Library of Science
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/250322
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/508003
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1061704
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1132596
dc.rights© 2021 Gould et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.source.urihttps://doi.org/10.1371/journal.pone.0256824
dc.subjectHumans
dc.subjectPremature Birth
dc.subjectFollow-Up Studies
dc.subjectChild Development
dc.subjectIntelligence
dc.subjectCognition
dc.subjectMotor Skills
dc.subjectWechsler Scales
dc.subjectPsychometrics
dc.subjectGestational Age
dc.subjectPregnancy
dc.subjectChild
dc.subjectInfant
dc.subjectInfant, Newborn
dc.subjectInfant, Premature
dc.subjectAustralia
dc.subjectFemale
dc.subjectMale
dc.titleConsequences of using chronological age versus corrected age when testing cognitive and motor development in infancy and intelligence quotient at school age for children born preterm
dc.typeJournal article
pubs.publication-statusPublished

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