Abstract
Examine agreement between the Test of Infant Motor Performance (TIMP) and the Bayley III. 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. 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%). 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.
Highlights
Accurate assessment of the motor performance of infants born prematurely or with other perinatal complications requires use of tests with validity for identifying delay or neurologic impairment
In a Korean sample Test of Infant Motor Performance (TIMP) scores from tests performed at term-equivalent age were highly predictive of scores on the Bayley II at 6 months corrected age (CA),[7,8] but the TIMP has not been compared to the Bayley III
Inter-rater reliability for the TIMP resulted in an intraclass correlation coefficient (ICC) of 0.79; for the Bayley Cognitive scale the ICC was 0.73(0.46, 0.86); for the Bayley Language scale the ICC was 0.75 (0.51, 0.87) and for the Bayley Motor scale the ICC was 0.75 (0.46, 0.88)
Summary
Accurate assessment of the motor performance of infants born prematurely or with other perinatal complications requires use of tests with validity for identifying delay or neurologic impairment. Documentation of the construct validity of a new assessment requires research demonstrating its relationships with other existing tests intended for similar purposes. In a Korean sample TIMP scores from tests performed at term-equivalent age were highly predictive of scores on the Bayley II at 6 months CA,[7,8] but the TIMP has not been compared to the Bayley III
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