Measuring mobility in people with lower limb amputation: Rasch analysis of the mobility section of the prosthesis evaluation questionnaire.
OBJECTIVE
To assess the psychometric properties of the Mobility Section of the Prosthesis Evaluation Questionnaire (PEQ-MS).


METHODS
A postal survey, including self-report assessment of prosthetic capability and performance with the PEQ-MS and the Locomotor Capabilities Index, and of other variables associated with prosthetic wear and use. The PEQ-MS data underwent Rasch analysis for rating scale diagnostics and a reliability and validity study.


METHODS
A total of 123 subjects (mean age 54 years) who had undergone lower limb amputation in the previous 5 years and who had completed rehabilitation and a prosthetic training programme.


RESULTS
According to Rasch analysis and expert review, some response categories of the PEQ-MS (13 items, 11-level numeric rating scale) were collapsed and one item was deleted. The remaining 12 items fitted to the Rasch model and created a revised scale with a 5-level response format, the PEQ-MS12/5. The PEQ-MS12/5 demonstrated good reliability (person-separation reliability = 0.95, item-separation reliability = 0.98) and internal construct validity. Moreover, the correlation with the Locomotor Capabilities Index (rs = 0.78) and with prosthetic wear and use (rs range 0.41-0.59) supported the convergent validity of the PEQ-MS12/5.


CONCLUSIONS
The new PEQ-MS12/5 presents good psychometric characteristics for measuring mobility in people with lower limb amputations. These preliminary results provide an already applicable instrument and a solid basis for further validation studies.
Franchignoni
Franco
F
Unit of Occupational Rehabilitation and Ergonomics, Rehabilitation Institute of Veruno, Veruno, Italy. ffranchignoni@fsm.it
Giordano
Andrea
A
Ferriero
Giorgio
G
Orlandini
Duccio
D
Amoresano
Amedeo
A
Perucca
Laura
L
D000328:Adult; D000368:Aged; D000671:Amputation, Surgical / Q000523:psychology / Q000534:rehabilitation*; D000674:Amputees / Q000523:psychology / Q000534:rehabilitation*; D001186:Artificial Limbs; D004185:Disability Evaluation; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D007866:Leg / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009068:Movement; D017063:Outcome Assessment, Health Care; D011474:Prosthesis Design; D011594:Psychometrics; D011795:Surveys and Questionnaires; D016138:Walking / Q000502:physiology