Article

This study explores the internal structure of the Self-Efficacy Scale (SES) using
item response analysis. The SES was previously translated into Swedish and
modified to encompass all types of pain, not exclusively back pain. Data on
perceived self-efficacy in 47 patients with subacute whiplash-associated
disorders were derived from a previously conducted randomized-controlled trial.
The item-level factor analysis was carried out using a six-step procedure. To
further study the item inter-relationships and to determine the underlying
structure empirically, the 20 items of the SES were also subjected to principal
component analysis with varimax rotation. The analyses showed two underlying
factors, named 'social activities' and 'physical activities', with seven items
loading on each factor. The remaining six items of the SES appeared to measure
somewhat different constructs and need to be analysed further.

Langue : ANGLAIS