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Concurrent validity of the TIMP and the Bayley III scales at 6 weeks corrected age
Suzann K Campbell1, Laura Zawacki, Kristin M Rankin
1Department 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.
Insights
The Test of Infant Motor Performance (TIMP) shows good agreement with the Bayley Motor scale for assessing preterm infants. The TIMP is recommended for earlier detection of motor delays.
Area of Science:
- Neonatal development
- Pediatric motor assessment
- Developmental pediatrics
Background:
- Early identification of motor delays in preterm infants is crucial for timely intervention.
- The Test of Infant Motor Performance (TIMP) and the Bayley Scales of Infant Development (Bayley III) are commonly used tools for infant assessment.
- Understanding the agreement between these measures is important for clinical practice.
Purpose of the Study:
- To examine the agreement between the Test of Infant Motor Performance (TIMP) and the Bayley III motor assessment.
- To evaluate the convergent validity of the TIMP with the Bayley III.
- To assess the utility of the TIMP in identifying motor delays in high-risk preterm infants.
Main Methods:
- One hundred forty-five infants born between 29 and 34 weeks gestation with socioenvironmental risk factors were assessed.
- Infants were tested using the TIMP and Bayley III at 6 weeks corrected age.
- Correlation and decision analysis were used to compare scores and assess agreement on motor delay classification.
Main Results:
- A moderate correlation (0.546) was found between the TIMP and the Bayley Motor Composite.
- Correlations with Bayley Cognitive (0.310) and Language (0.281) scales were weaker.
- Nine percent of infants scored below -1.0 SD on the TIMP, while none scored below -1 SD on the Bayley Motor scale.
Conclusions:
- The TIMP demonstrates convergent validity with the Bayley Motor scale, supporting its use in assessing preterm infants.
- No infants in the study population showed delay on any Bayley scale, highlighting a potential limitation in detecting early delays with Bayley III.
- The TIMP is suggested as a preferred tool for early motor assessment in infants due to its sensitivity in identifying potential delays.
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.
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