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Rater reliability and scoring duration of the Quality Function Measure in ambulant children with hyperkinetic movement disorders
Author(s) -
Tustin Kylee,
Gimeno Hortensia,
Morton Erin,
Marsden Jonathan
Publication year - 2016
Publication title -
developmental medicine and child neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.658
H-Index - 143
eISSN - 1469-8749
pISSN - 0012-1622
DOI - 10.1111/dmcn.13081
Subject(s) - intraclass correlation , inter rater reliability , physical therapy , psychology , physical medicine and rehabilitation , intra rater reliability , gross motor function classification system , limits of agreement , bland–altman plot , reliability (semiconductor) , confidence interval , medicine , audiology , psychometrics , rating scale , cerebral palsy , developmental psychology , nuclear medicine , power (physics) , physics , quantum mechanics
Aim To examine intra‐ and interrater reliability/agreement, and time taken to score, when the Quality Function Measure ( QFM ) is applied to children with hyperkinetic movement disorders ( HMD ; e.g. dystonia, chorea, athetosis, tremor, and myoclonus). Method Fifteen ambulant children with HMD participated (eight males, seven females; mean age 13y 7mo, SD 3y 7mo). Three trained raters (two physiotherapists, one occupational therapist) independently scored the QFM using videos of each child performing Gross Motor Function Measure ( GMFM ) Stand and Walk/Run/Jump dimensions. Reliability was evaluated using intraclass correlation coefficient ( ICC ) model 2.1, Standard Error of Measurement ( SEM ), and Bland–Altman methods. Results Rater reliability was excellent for all five QFM attributes: intrarater ICC s ≥0.98 (95% confidence interval [ CI ] 0.83–1.00), and interrater ICC s ≥0.96 (95% CI 0.91–1.00). SEM varied from 2.07% to 4.72% points for intra‐ and interrater scores across QFM attributes. Bland–Altman tests demonstrated close agreement between ratings, with absolute mean differences varying from 0.34% to 3.23% (intrarater) to 1.67% to 3.82% (interrater). Median scoring duration time was 83 minutes (range 56–144min, SD 16.02). Interpretation Low measurement error attributable to rater effects suggests the QFM has potential as an evaluative measure in research studies involving children with HMD , though its lengthy scoring requirements are an important consideration for clinical practice. Evaluation of test–retest reliability and responsiveness is required.