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Outcome tools used for ambulatory children with cerebral palsy: responsiveness and minimum clinically important
D Oeffinger1, A Bagley, S Rogers
1Shriners Hospital for Children, Lexington, KY 40502, USA. doeffinger@shrinenet.org
Insights
This study assessed outcome tools for children with cerebral palsy (CP), finding that functional measures are responsive when changes impact Gross Motor Function Classification System (GMFCS) levels. Minimum clinically important differences (MCIDs) were established for future research.
Area of Science:
- Pediatric rehabilitation
- Clinical outcomes research
- Cerebral palsy (CP) management
Background:
- Assessing functional changes in ambulatory children with cerebral palsy (CP) is crucial for guiding interventions.
- Standardized outcome tools are essential, but their responsiveness and the definition of clinically meaningful change require ongoing investigation.
- Establishing minimum clinically important differences (MCIDs) provides benchmarks for interpreting patient progress.
Purpose of the Study:
- To evaluate the responsiveness of various outcome tools in ambulatory children with CP.
- To systematically define MCIDs for these tools in the context of CP.
- To inform the design of future intervention studies by providing reliable measures of meaningful change.
Main Methods:
- A prospective, longitudinal, multicenter study involving 381 ambulatory children with CP (GMFCS Levels I-III).
- Data collected at baseline and at least 1-year follow-up included multiple functional assessments, gait parameters, and oxygen cost.
- Tool responsiveness was determined using adjusted standardized response means; MCIDs were calculated from nonsurgical group changes and verified by GMFCS level shifts.
Main Results:
- Several outcome tools demonstrated medium to large effect sizes, particularly for children in GMFCS Level III.
- The study successfully calculated MCID thresholds for ambulatory children with CP using nonsurgical group data.
- Tool responsiveness was confirmed when changes corresponded to shifts in GMFCS levels, indicating clinical significance.
Conclusions:
- Functional outcome tools are responsive in ambulatory children with CP, especially when changes affect functional classification.
- Defined MCID thresholds offer valuable benchmarks for assessing change over time and designing future intervention trials.
- This research provides a foundation for evidence-based practice and the development of targeted pediatric CP therapies.
Abstract:
This prospective longitudinal multicenter study of ambulatory children with cerebral palsy (CP) examined changes in outcome tool score over time, tool responsiveness, and used a systematic method for defining minimum clinically important differences (MCIDs). Three hundred and eighty-one participants with CP (Gross Motor Function Classification System [GMFCS] Levels I-III; age range 4-18y, mean age 11y [SD 4y 4mo]; 265 diplegia, 116 hemiplegia; 230 males, 151 females). At baseline and follow-up at least 1 year later, Functional Assessment Questionnaire, Gross Motor Function Measure, Pediatric Quality of Life Inventory, Pediatric Outcomes Data Collection Instrument, Pediatric Functional Independence Measure, temporal-spatial gait parameters, and oxygen cost were collected. Adjusted standardized response means determined tool responsiveness for nonsurgical (n=292) and surgical (n=87) groups at GMFCS Levels I to III. Most scores reaching medium or large effect sizes were for GMFCS Level III. Nonsurgical group change scores were used to calculate MCID thresholds for ambulatory children with CP. These values were verified by examining participants who changed GMFCS levels. Tools measuring function were responsive when a change large enough to cause a change in GMFCS level occurred. MCID thresholds assess change in study populations over time, and serve as the basis for designing prospective intervention studies.
