Using 2 Versions of the Test of Gross Motor Development to Classify and Screen Young Children's Motor Skills: A Comparison Study

Purpose: The purpose of this study was to examine comparability between 2 editions of the Test of Gross Motor Development (TGMD-second and TGMD-third edition) on (1) how children's motor skills were categorized as average or below average, and (2) how children are screened for being at-risk for motor delay or with delayed motor skills. Methods: Participants were 226 children (Mage = 53.4 mo, 125 boys). All children completed full TGMD-2 and TGMD-3. Children were classified as average or above (>25th percentile) or below average (<= 25th percentile) and, when applicable, as developmental delay (<= 5th percentile) or at-risk for developmental delay (6-25th percentile). We compared children's classifications across TGMD editions using percent agreement and chi-squared tests. Results: The TGMD-2 and TGMD-3 had moderate agreement when categorizing children as below average (72.2% for total skills, 76.0% for locomotor skills, and 73% for ball skills). The TGMD-3 was significantly more likely to categorize children's motor skill performance as average or above (all P < .01). Conclusion:<bold> </bold>TGMD-2 and TGMD-3 similarly screen children who demonstrate below average skills (<= 25th percentile), but not for specific skill level classifications, including above average, at-risk for delays, and delayed.