title: Concurrent validity of the Bayley-III and the Peabody Developmental Motor Scale-2.
abstract: OBJECTIVE
  To determine concurrent validity of the Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III) and the Peabody Developmental Motor Scales, Second Edition (PDMS-2).
  
  
  METHODS
  Tests were administered to 48 children with corrected age ranging from 29 days to 26 months. Concurrent validity between age-equivalent (AE) scores and standard scores was assessed for 4 age groups.
  
  
  RESULTS
  Moderate to very high correlation for all groups was found between the Bayley-III composite scores and the PDMS-2 Total Motor quotient scores. High correlations were found between the Bayley-III composite scores and the PDMS-2 Gross and Fine Motor quotients (12-26 months); high correlations were found between the Bayley-III and the PDMS-2 Gross Motor quotient (6-12 months) and moderate correlations were found for younger age groups. High concurrent validity for AE scores was found only above 18 months.
  
  
  CONCLUSIONS
  The study supports the substitution of the Bayley-III for the PDMS-2 for standard scores or AE scores for children aged 19 to 26 months and for standard scores for children birth to 18 months.
authors.affiliation: Department of Physical Therapy, University of Tennessee Health Science Center, Memphis, Tennessee, USA. bconnoll@uthsc.edu
authors.forename: Barbara H
authors.initials: BH
authors.lastname: Connolly
authors.forename: Nancy Oberg
authors.initials: NO
authors.lastname: McClune
authors.forename: Roberta
authors.initials: R
authors.lastname: Gatlin
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002658:Developmental Disabilities / Q000175:diagnosis* / Q000473:pathology; D005260:Female; D048788:Growth and Development / Q000502:physiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009048:Motor Skills / Q000502:physiology*; D009483:Neuropsychological Tests; D011594:Psychometrics; D015203:Reproducibility of Results