Abstract
Objectives
To examine the dimensionality of the Wheelchair Use Confidence Scale for power wheelchair
users (WheelCon-P), to identify items that do not fit the Rasch rating scale model
as well as redundant items for elimination, and to determine the SEMs and reliability
estimates for the entire range of measurements.
Design
Secondary analysis of cross-sectional data.
Setting
Community.
Participants
Volunteer participants (N=189) using wheelchairs (mean age of the sample, 56.7±13.0y;
mean years of wheelchair use experience, 20.4±16.4).
Interventions
Not applicable.
Main Outcome Measures
59-Item WheelCon-P.
Results
Principal component analyses confirmed the presence of 2 self-efficacy dimensions:
mobility and social situation. Eleven mobility items and 5 social situation items
fit the Rasch rating scale model. Three items misfit the model using all 16 items
(ie, WheelCon-P short form). In each of the mobility, social situation, and WheelCon-P
short form range of measurements, the 2 lowest and 2 highest measures had internal
consistency reliability estimates below .70; all other measures had reliability estimates
above .70.
Conclusions
The WheelCon-P is composed of 2 self-efficacy dimensions related to mobility and social
situations. The scores from the WheelCon-P short form and the 11-item mobility and
5-item social situation dimensions using a 0 to 10 response scale have good reliability.
Keywords
List of abbreviations:
PCA (principal component analysis), WheelCon-M (Wheelchair Use Confidence Scale for manual wheelchair users), WheelCon-P (Wheelchair Use Confidence Scale for power wheelchair users)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: September 27, 2017
Footnotes
Supported by the Canadian Institutes of Health Research (grant no. AMG 100925) and Michael Smith Foundation for Health Research.
Disclosures: none.
Identification
Copyright
© 2017 by the American Congress of Rehabilitation Medicine
