Precision in Progress: Unraveling the Clinimetric Properties of Beery-Buktenica Developmental Test of Visual-Motor Integration in Children With Cerebral Palsy Across Diverse Motor Severities

Background: In the realm of pediatric cerebral palsy (CP), visual motor challenges often overshadow a child's developmental journey. This study delves into the responsiveness and crucial benchmarks, specifically the minimal clinically important difference (MCID), of the Beery-Buktenica Developmental Test of Visual-Motor Integration (Beery VMI) among children with varying motor severities. Method: Eighty-eight children with CP (50 males, 38 females; aged three to 12 years) with Gross Motor Function Classification System (GMFCS) levels I to III were recruited from the rehabilitation department of Chang Gung Memorial Hospital in Taiwan. Each participant received the Beery VMI tests at baseline and at one-year follow-up. The standardized response mean (SRM) was calculated to determine the responsiveness of Beery VMI, and a distribution-based approach was used to estimate MCID. Results: The Beery VMI exhibited remarkable responsiveness across GMFCS levels I to III (SRM = 0.98-2.36). MCIDs for Beery VMI varied across severities, with ranges of 2.93 to 4.41 (0.2 S.D.), 7.31 to 11.49 (0.5 S.D.), and 11.70 to 18.38 (0.8 S.D.). Notably, in the visual perception subset, MCIDs were 3.93 to 4.03 (0.2 S.D.), 9.83 to 10.07 (0.5 S.D.), and 15.73 to 16.11 (0.8 S.D.). In the supplemental motor coordination subtest, MCIDs spanned 1.67 to 4.87 (0.2 S.D.), 4.18 to 12.17 (0.5 S.D.), and 6.68 to 19.47 (0.8 S.D.). Conclusions: Beery VMI demonstrates robust responsiveness in children with CP. Motor-severity-tailored MCIDs offer a guide for clinicians and researchers, hinting at treatment efficacy. Particularly, lower change scores in VMI and motor coordination subtests may signal effective interventions for moderate motor disability over mild cases.