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Pediatric Physical Therapy:
doi: 10.1097/PEP.0b013e31829db85b
Research Article

Concurrent Validity of the TIMP and the Bayley III Scales at 6 Weeks Corrected Age

Campbell, Suzann K. PT, PhD, FAPTA; Zawacki, Laura PT, MS, PCS; Rankin, Kristin M. PhD; Yoder, Joseph C. MS; Shapiro, Nicole BA, RN; Li, Zhuoying MS; White-Traut, Rosemary RN, PhD, FAAN

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Purpose: Examine agreement between the Test of Infant Motor Performance (TIMP) and the Bayley III.

Methods: One hundred forty-five infants born at 29 to 34 weeks gestation with socioenvironmental risk factors were tested on the TIMP and Bayley III at 6 weeks corrected age (CA). Scores were correlated to assess convergence/divergence of content. Decision analysis using a cutoff of the mean on the Bayley Motor Composite and −0.5 and −1 SD from the mean on the TIMP assessed agreement on delay/nondelay.

Results: The TIMP-Bayley Motor Composite correlation was 0.546, with Cognitive was 0.310, and with Language was 0.281. Nine percent of infants scored less than −1.0 SD on the TIMP, while no child scored less than −1 SD on the Bayley Motor scale (sensitivity, 31%).

Conclusions: Convergent validity between the TIMP and the Bayley Motor scale was demonstrated, but no infant showed delay on any Bayley scale. The TIMP is preferred for early assessment of infants.

© 2013 Wolters Kluwer Health | Lippincott Williams & Wilkins and the Section on Pediatrics of the American Physical Therapy Association.


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