Stability and relative validity of the Neuromuscular Disease Impact Profile (NMDIP)

Bos, I., Kuks, J. B. M., Almansa, J., Kremer, H. P. H. & Wynia, K. 11-May-2017 In : BMC NEUROLOGY. 17, 87, 8 p.

Research output: Scientific - peer-reviewArticle

Background: The aim of this study was to examine the stability and relative validity (RV) of the Neuromuscular Disease Impact Profile (NMDIP) using criterion-related groups. In a previous study the NMDIP-scales showed good internal consistency, convergent and discriminant validity. Known-groups analysis showed that the NMDIP discriminates between categories of extent of limitations.

Methods: A cross-sectional postal survey study was performed on patients diagnosed with a NMD and registered at the Department of Neurology, University Medical Center Groningen, the Netherlands.

Participants were asked to complete the preliminary NMDIP, the Medical Outcome study Short Form Questionnaire (SF-36), the World Health Organization Quality Of Life-abbreviation version (WHOQOL-bref), and two generic domain specific:measures the Groningen Activity Restriction Scale (GARS) and the Impact on Participation and Autonomy Questionnaire (IPAQ). The variables 'Extent of Limitations' and 'Quality of Life' were used to create criterion-related groups. Stability over time was tested using the Wilcoxon Signed Rank Test for paired samples and the intraclass-correlation coefficients for repeated measures. RV was examined by comparing the ability of NMDIP with generic multidimensional health impact measures, and domain specific measures in discriminating between criterion-related subgroups using the Kruskal-Wallis H-test.

Results: Response rate was 70% (n = 702). The NMDIP-scales showed sufficient stability over time, and satisfactory or strong RV. In general, the NMDIP scales performed as well as or better than the concurrent measurement instruments.

Conclusions: The NMDIP proved to be a valid and reliable disease-targeted measure with a broad scope on physical, psychological and social functioning.

Original languageEnglish
Number of pages8
Issue number87
StatePublished - 11-May-2017


  • Neuromuscular Disease Impact Profile, Relative validity, Test-retest reliability, Stability, Criterion validity, TESTING PSYCHOMETRIC PROPERTIES, HEALTH SURVEY SF-36, QUALITY-OF-LIFE, ASSESSMENT QUESTIONNAIRE, CONCEPTUAL-FRAMEWORK, PARTICIPATION, VALIDATION, MSIP

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