Psychometric properties of the General Self-Efficacy Scale in Parkinson's disease

Nilsson, M. H., Hagell, P. and Iwarsson, S. (2015) Psychometric properties of the General Self-Efficacy Scale in Parkinson's disease. Acta Neurologica Scandinavica, 132 2: 89-96. doi:10.1111/ane.12368

Author Nilsson, M. H.
Hagell, P.
Iwarsson, S.
Title Psychometric properties of the General Self-Efficacy Scale in Parkinson's disease
Journal name Acta Neurologica Scandinavica   Check publisher's open access policy
ISSN 0001-6314
Publication date 2015
Year available 2015
Sub-type Article (original research)
DOI 10.1111/ane.12368
Open Access Status
Volume 132
Issue 2
Start page 89
End page 96
Total pages 8
Place of publication Malden, MA United States
Publisher Wiley-Blackwell Publishing
Collection year 2016
Language eng
Formatted abstract
This study aimed to investigate the psychometric properties of the General Self-Efficacy Scale (GSE) in people with Parkinson's disease (PD). More specifically, we investigated data completeness, scaling assumptions, targeting, reliability, and construct validity.

Materials and methods
This study involves data available from two different projects that included people diagnosed with PD for at least 1 year, yielding two samples (1 and 2). The combined total sample (N = 346; 60% men) had a mean (SD) age and PD duration of 71 (8.9) and 9 years (6.3), respectively. Both samples received a self-administered survey by mail, which was administered twice in sample 2. Additional data (e.g., clinical assessments) were available for Sample 1.

Total GSE scores were computable for 336 participants (97%). Corrected item–total correlations exceeded 0.4. Principal component analyses identified one component (the eigenvalue of the first component extracted was 6.9), explaining 69% of the total variance. Floor and ceiling effects were < 6%. Internal consistency (coefficient alpha) was 0.95. Analyses of test–retest reliability yielded (ICC) values from 0.69 to 0.80. The highest value refers to those (n = 47) with identical self-ratings of mobility (in the on condition) at both tests; the standard error of measurement was 3.1 points. Construct validity was further supported by correlations in accordance with a priori expectations.

This study provides support for the validity and reliability of GSE scores in people with PD; the GSE can thus serve as a valuable outcome measurement in clinical practice and research
Keyword Parkinsons disease
Patient outcome assessment
Reliability and validity
Self efficacy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Nursing, Midwifery and Social Work Publications
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 02 Feb 2015, 13:25:37 EST by Vicki Percival on behalf of School of Nursing, Midwifery and Social Work