Article

OBJECTIVE: To perform a detailed psychometric analysis using both classical test
theory and Rasch analysis of the three main scales of the Trinity Amputation and
Prosthesis Experience Scales (TAPES) in people with a lower-limb amputation.
DESIGN: A sample of 498 persons who were prosthesis users with a lower-limb
amputation was retrospectively studied, pooled from a number of studies
undertaken across the United Kingdom and Ireland in the past decade in which the
TAPES had been completed as part of a postal survey. Both factor analysis
techniques and Rasch analysis were performed on TAPES data. Dimensionality, item
fit to the model, response category performance, and internal construct validity
were assessed. Category collapsing and item removal were considered to improve
the questionnaire. RESULTS: The analyses suggested to restructure the TAPES as
follows: (a) three psychosocial adjustment subscales with a four-point rating
scale (and a reworded item); (b) an activity restriction scale based on ten items
with their original three-point rating scale; and (c) two satisfaction with the
prosthesis subscales using a three-point rating scale. All scales and subscales
showed acceptable internal consistency and ability to define a distinct hierarchy
of persons along the measured construct. CONCLUSIONS: This study empirically
identified a revised version of the TAPES (TAPES-R) with a simplified general
structure and psychometrically suitable for assessing the complex experience of
amputation and adjustment to a lower-limb prosthesis. Additional studies are
needed to confirm and further explore its measurement properties in other
samples, thereby adding clinical validity to the instrument.

Langue : ANGLAIS