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This document discusses the refinement and evaluation of the Gross Motor Family Report (GM-FR), a tool used to assess gross motor function in children and adolescents with cerebral palsy. The study involved input from families to ensure the content validity of the measure. The GM-FR demonstrated high internal consistency and test-retest reliability. It also showed strong concurrent validity with other measures of gross motor function. The findings suggest that the GM-FR is a reliable and valid tool for assessing gross motor activity in children with cerebral palsy. [Extracted from the article]

Aim Method Results Interpretation To refine the Gross Motor Family Report (GM‐FR) using parents' input and to evaluate its psychometric properties.In this measurement study, 12 parents of children and adolescents with cerebral palsy (CP), aged 2 to 18 years, classified in all levels of the Gross Motor Function Classification System (GMFCS), were interviewed about their experience completing the GM‐FR (content validity). Parents' feedback was used to refine the measure which was then completed by 146 families to evaluate internal consistency, and discriminative and concurrent validity. Forty‐six parents completed the GM‐FR again, 7 to 30 days later, to evaluate test–retest reliability.GM‐FR scoring, pictures, descriptions, and the total number of items were revised based on parents' feedback. The GM‐FR version 2.0 demonstrated high internal consistency (Cronbach's α = 0.99), no floor/ceiling effects, and excellent test–retest reliability (intraclass correlation coefficient = 0.99). GM‐FR scores discriminated between GMFCS levels (p < 0.05) and were strongly negatively correlated with GMFCS level (r = −0.92; p < 0.001). GM‐FR scores correlated positively and strongly with the Gross Motor Function Measure‐66 (r = 0.94; p < 0.001) and the Pediatric Evaluation of Disability Inventory – Computer Adaptive Test mobility domain (r = 0.93; p < 0.001).Active participation of families in the GM‐FR's development facilitated creation of a family‐friendly instrument. This study provides strong evidence of reliability and validity to support GM‐FR use in clinical practice and research for assessing gross motor performance of children and adolescents with CP. [ABSTRACT FROM AUTHOR]