Construct Validity of the Observable Movement Quality Scale in Pediatrics: Hypothesis Testing of a Formative Measurement Model.
Lieke M A Dekkers, Anjo J W M Janssen, A Rogier T Donders and 2 others
PMID 32031656WHAT IT FOUND
The OMQ Scale accurately reflects movement quality in children with motor disabilities.
Scores dropped as disability severity increased and correlated with standard motor test results. Use it alongside quantitative tests, as children with good movement quality can still have severe functional limitations.
Key findings
01OMQ Scale total scores decreased significantly as the severity of motor disabilities increased, confirming the scale's ability to distinguish between children with no, mild, or severe motor disabilities.
02There was a moderate positive correlation between OMQ Scale total scores and z-scores on standard motor tests, indicating the scale aligns with established measures of motor performance.
03Six of seven hypotheses regarding construct validity were confirmed, meeting the COSMIN criteria for sufficient validity in this pediatric population.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was conducted at a single center, which may limit how well the results apply to other populations. Data was collected retrospectively from clinical practice, which is less controlled than a prospective study. Only one therapist, who was involved in developing the OMQ Scale, performed the assessments, introducing potential bias. The sample was enriched for children with mitochondrial dysfunction, and the study did not include subgroups like neuromuscular diseases or syndromes, which may affect validity in those groups. Responsiveness and intrarater reliability of the OMQ Scale have not yet been established.
Declared interests
Funded by the Netherlands Organization for Scientific Research. The funder had no role in the study design, data collection, analysis, or manuscript preparation. No other conflicts of interest were declared.
The easy way to misread this
Do not assume that a high OMQ score means a child has no severe motor disability. The study found children with severe functional limitations who had good movement quality, often because their limitations were due to fatigue rather than poor movement mechanics.