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Concurrent validity of the Bayley Scales of Infant Development II (BSID-II) Motor Scale and the Peabody Developmental

Barbara H Connolly1, Lauri Dalton, Jennifer Bengston Smith

  • 1Department of Physical Therapy, University of Tennessee Health Services Center, Memphis, TN 38163, USA. bconnolly@utmem.edu

Pediatric Physical Therapy : the Official Publication of the Section on Pediatrics of the American Physical Therapy Association
|August 17, 2006
PubMed

Insights

Concurrent validity between the Peabody Developmental Motor Scale II (PDMS-2) and Bayley Scales of Infant Development II (BSID-II) motor scales is low, except for locomotion. Caution is advised when using single scores for early intervention decisions in 12-month-olds.

Area of Science:

  • Developmental Psychology
  • Pediatric Motor Development
  • Infant Assessment

Background:

  • Accurate assessment of infant motor development is crucial for identifying developmental delays and guiding early intervention.
  • The Peabody Developmental Motor Scale II (PDMS-2) and the Bayley Scales of Infant Development II (BSID-II) Motor Scale are commonly used tools for evaluating motor skills in infants.
  • Understanding the concurrent validity between these widely used scales is essential for clinicians and researchers.

Purpose of the Study:

  • To examine the concurrent validity of the PDMS-2 and the BSID-II Motor Scale in typically developing 12-month-old infants.
  • To compare standard scores and age equivalent scores between the two assessment tools.

Main Methods:

  • Administered the PDMS-2 and BSID-II Motor Scale to fifteen 12-month-old infants.
  • Calculated Gross Motor Quotient (GMQ), Fine Motor Quotient (FMQ), and Total Motor Quotient (TMQ) for PDMS-2.
  • Derived Psychomotor Development Index (PDI) for BSID-II.
  • Compared age equivalent scores using Pearson Product-Moment Correlation Coefficient.

Main Results:

  • Low correlations were observed between PDMS-2 quotients (GMQ, FMQ, TMQ) and the BSID-II PDI.
  • Low correlations were found between most PDMS-2 subtest age equivalents and the BSID-II Motor Scale.
  • A high correlation (r = 0.71) was found between the PDMS-2 locomotion subtest age equivalent and the BSID-II Motor Scale.

Conclusions:

  • There is a lack of concurrent validity between the standard scores of the PDMS-2 and BSID-II Motor Scale.
  • Agreement between age equivalent scores is limited, with the exception of the locomotion subtest.
  • Clinicians should exercise caution when using single scores from either the PDMS-2 or BSID-II for early intervention decisions in 12-month-old infants.
Abstract

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