Reliability of functional outcome measures in adults with neurofibromatosis 1

Mullin, R.L., Golding, J.F., Smith, R., Williams, V., Thomas, M. and Ferner, R.E. 2018. Reliability of functional outcome measures in adults with neurofibromatosis 1. SAGE Open Medicine . 6, pp. 1-7.

TitleReliability of functional outcome measures in adults with neurofibromatosis 1
AuthorsMullin, R.L., Golding, J.F., Smith, R., Williams, V., Thomas, M. and Ferner, R.E.
Abstract

Objectives: To determine intra-rater and inter-rater reliability of functional outcome measures in adults with neurofibromatosis 1 (NF1) and to ascertain how closely objective and subjective measures align.

Methods: Forty-nine ambulant adults with NF1 aged 16 years and over were included in this observational study. Median age 31 years (range 16-66), 29 females, 20 males. Participants were video-recorded or photographed performing four functional outcome measures. Four raters from the Neurofibromatosis centre multi-disciplinary team independently scored the measures to determine inter-rater reliability. One rater scored the measures a second time on a separate occasion to determine intra-rater reliability. The measures evaluated were the functional reach, timed up and go, ten metre walk and a modified nine-hole peg tests. Participants also completed a disease specific quality of life questionnaire (INF1-QOL).

Results: Inter-rater reliability and intra-rater reliability scores (intra-class coefficient, ICC) were similar for each outcome measure. Excellent rater agreement (ICC r ≥ 0.9) was found for the functional reach, timed up and go and the 10 metre walk tests. Rater agreement was good for the modified 9-hole peg test; ICC r= 0.75 for intra-rater reliability and 0.76 for inter-rater reliability. The timed up and go and the 10 metre walk tests correlated highly with perceived mobility challenges in the quality of life questionnaire (INF1-QOL).

Conclusions: The functional reach, timed up and go and 10 metre walk tests are potentially useful outcome measures for monitoring NF1 treatment and will be assessed for validity and reliability in future multi-centre studies.

KeywordsNeurofibromatosis 1, NF1, outcome measure, rater reliability, standard error measurement, minimal detectable change.
JournalSAGE Open Medicine
Journal citation6, pp. 1-7
ISSN2050-3121
Year2018
PublisherSage
Publisher's versionNF1_Functional_Outcome_Measures_2018.pdf
Digital Object Identifier (DOI)doi:10.1177/2050312118786860
Publication dates
Published23 Jul 2018
LicenseCC BY-NC 4.0

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