Reliability and construct validity of the Duchenne Video Assessment

Area of Science:

• Neurology
• Physical Therapy
• Digital Health

Background:

• Duchenne muscular dystrophy (DMD) is a severe genetic disorder impacting muscle strength.
• Assessing DMD disease severity is crucial for monitoring progression and treatment efficacy.
• Current assessment methods may require specialized clinical settings.

Purpose of the Study:

• To evaluate the reliability and construct validity of the Duchenne Video Assessment (DVA) tool.
• To determine if DVA scores accurately reflect DMD disease severity.
• To establish the DVA as a viable method for home-based assessment of movement quality in DMD patients.

Main Methods:

• Physical therapists (PTs) were trained as DVA raters.
• Raters assessed video recordings of patients performing standardized movement tasks.
• Inter-rater and intra-rater reliability were calculated using intraclass correlation coefficients (ICCs).
• Construct validity was tested by comparing DVA scores with known DMD severity groups and the Pediatric Outcomes Data Collection Instrument (PODCI).

Main Results:

• High inter-rater reliability (ICC 0.70-0.97) and intra-rater reliability (ICC 0.82-0.98) were observed.
• Statistically significant differences in DVA scores were found across known DMD severity groups.
• DVA scores showed strong correlations with related PODCI physical function constructs.

Conclusions:

• The Duchenne Video Assessment (DVA) is a reliable and valid tool for assessing DMD disease severity.
• The DVA provides an objective measure of movement quality for individuals with DMD.
• Home-based video assessments using the DVA can effectively support clinical evaluations.