Share this article on:

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

doi: 10.1097/PEP.0b013e31829db85b
Research Article

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.

In this study of infants born preterm and with socioeconomic risk factors, the authors found concurrent validity between the TIMP and Bayley III but because no infant demonstrated delay on the Bayley III, they recommend use of the TIMP with this population.

Department of Physical Therapy, College of Applied Health Sciences (Dr Campbell), Department of Women, Children and Family Health Science, College of Nursing (Mr Yoder, Mss Shapiro and Li, and Dr White-Traut), and School of Public Health (Dr Rankin), University of Illinois at Chicago, Chicago, Illinois; Department of Physical and Occupational Therapy (Ms Zawacki), University of Illinois Hospital and Health Sciences System, Chicago, Illinois; Children's Hospital of Wisconsin Research Institute (Dr White-Traut), Milwaukee, Wisconsin.

Correspondence: Suzann K. Campbell, PT, PhD, FAPTA, 1301 W. Madison St, Unit 526, Chicago, IL 60607 (

Grant support: This work was supported by grants from the National Institutes of Child Health and Human Development, the National Institute of Nursing Research (1 R01 HD050738-01A2), and the Harris Foundation (Dr White-Traut, principal investigator).

Suzann K. Campbell is the coowner of Infant Motor Performance Scales, LLC (IMPS), the publisher of the Test of Infant Motor Performance. Laura Zawacki teaches at workshops on the Test of Infant Motor Performance for IMPS.

The authors declare no other conflicts of interest.

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