The Prosthetic Mobility Questionnaire, a tool for assessing mobility in people with lower-limb amputation: validation of PMQ 2.0 in Slovenia

Helena Burger, Andrea Giordano, Andrej Bavec, Franco Franchignoni

Research output: Contribution to journalArticle

Abstract

The aim of this study was to examine the metric properties of the Prosthetic Mobility Questionnaire, an outcome measure of mobility following lower-limb amputation, in Slovene outpatients undergoing rehabilitation. The 12-item Prosthetic Mobility Questionnaire was administered to 148 Slovene adults (74% men) with unilateral lower-limb amputation since >12 months and regularly wearing a prosthesis. The psychometric analysis included classical test theory methods and Rasch models. Rasch analysis disclosed two pairs of locally dependent items (same task but in opposite directions: walk up/down stairs; walk up/down a hill). Thus, we devised a new version (PMQ 2.0) assessing all 12 Prosthetic Mobility Questionnaire items but calculating the global score on only 10, i.e. considering-for each pair of locally dependent items-just the item with worst performance. The PMQ 2.0 demonstrated correct functioning of rating scale categories, construct validity (item fit, hierarchy of item difficulties), convergent validity, high-reliability indices and unidimensionality. In conclusion, the new 10-item PMQ 2.0 shows good reliability and validity, and an excellent overall metric quality for measuring perceived mobility capabilities in people with lower-limb amputation.

Keywords

  • Adult
  • Aged
  • Aged, 80 and over
  • Amputation/rehabilitation
  • Artificial Limbs
  • Cross-Sectional Studies
  • Female
  • Humans
  • Lower Extremity/surgery
  • Male
  • Middle Aged
  • Patient Reported Outcome Measures
  • Reproducibility of Results
  • Sampling Studies
  • Slovenia
  • Surveys and Questionnaires
  • Walking/physiology
  • Young Adult

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