A Psychometric Evaluation of the Motor-Behavioral Assessment Scale for Use as an Outcome Measure in Rett Syndrome Clinical Trials.
The MBA scale is trial-ready for Rett syndrome; it gives one reliable score each for motor, social, daily-living, aberrant, and breathing symptoms.
01Research in Context
What this study did
The team tested the Motor-Behavioral Assessment (MBA) scale for girls and women with Rett syndrome. They wanted a tool that drug trials could trust to track change.
They ran factor analysis and checked internal consistency. The final scale keeps 36 items split across five areas: motor, daily-living, social, aberrant behavior, and breathing.
What they found
The five-factor MBA came out reliable and valid. It captures the main symptom groups that matter in Rett syndrome.
Clinicians can now use one short scale instead of juggling several tools.
How this fits with other research
Efstratopoulou et al. (2012) did the same kind of check on the Motor Behavior Checklist for general-ed teachers. Both studies show motor-behavior rating scales can hold up across raters.
Mirenda et al. (2010) and Schertz et al. (2016) validated the Repetitive Behavior Scale-Revised for kids with autism. Their factor work mirrors the MBA study, but they focused on autism, not Rett.
Wuang et al. (2009) used Rasch methods to trim the BOT-2 for kids with intellectual disability. Like the MBA team, they proved a shorter, cleaner motor measure can still be tough enough for clinical trials.
Why it matters
If you run or consult on Rett syndrome trials, you now have a single outcome tool that sponsors will accept. The MBA takes ten minutes, covers five key domains, and has the psychometric muscle to show real change. Add it to your protocol and stop patching together three or four older scales.
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02At a glance
03Original abstract
Rett syndrome (RTT) is a neurodevelopmental disorder that primarily affects females. Recent work indicates the potential for disease modifying therapies. However, there remains a need to develop outcome measures for use in clinical trials. Using data from a natural history study (n = 1,075), we examined the factor structure, internal consistency, and validity of the clinician-reported Motor Behavior Assessment scale (MBA). The analysis resulted in a five-factor model: (1) motor dysfunction, (2) functional skills, (3) social skills, (4) aberrant behavior, and (5) respiratory behaviors. Item Response Theory (IRT) analyses demonstrated that all items had acceptable discrimination. The revised MBA subscales showed a positive relationship with parent reported items, age, and a commonly used measure of clinical severity in RTT, and mutation type. Further work is needed to evaluate this measure longitudinally and to add items related to the RTT phenotype.
American journal on intellectual and developmental disabilities, 2020 · doi:10.3389/fncel.2015.00055