Measurement properties of the Fear-Avoidance Belief Questionnaire for physical activity in patients with shoulder impingement syndrome
Authors Trolle N, Christiansen DH
Received 22 October 2018
Accepted for publication 1 January 2019
Published 19 March 2019 Volume 2019:10 Pages 83—87
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Professor Lynne Nemeth
Nûno Trolle,1 David H Christiansen1,2
1Danish Ramazzini Centre, Regional Hospital West Jutland, Department of Occupational Medicine, University Research Clinic, Herning, Denmark; 2Department of Clinical Medicine, Health, Aarhus University, Aarhus, Denmark
Background: The Fear-Avoidance Belief Questionnaire for physical activity (FABQ-PA) was originally developed for patients with low-back pain. Whether the FABQ-PA is suitable for use among patients with other musculoskeletal disorders has been sparsely evaluated.
Purpose: To evaluate test–retest reliability, measurement error, construct validity, and responsiveness of the FABQ-PA in patients with shoulder impingement syndrome (SIS).
Methods: This prospective cohort study included 45 patients with SIS. Data were collected with questionnaires at baseline, after 2–4 days, and at 3 months, which included the Danish versions of the FABQ-PA and the Oxford Shoulder Score (OSS). Test–retest reliability was assessed by intraclass correlation, and standard error of measurement was estimated and converted into the minimal detectable change (MDC). Construct validity was investigated by analyzing the correlation between the baseline scores of the FABQ-PA and the OSS. Responsiveness was investigated from longitudinal construct validity using a correlation analysis reflecting changes over time.
Results: Test–retest reliability showed an intraclass correlation of 0.80, and examination of the measurement error showed no systematic differences and a MDC of 7.95 (95% CI 6.57–10.07). Construct validity showed a correlation of –0.60 (95% CI –0.76 to –0.37) between the FABQ-PA and OSS at baseline. A weaker correlation between FABQ-PA- and OSS-change scores was observed (–0.43, 95% CI –0.67 to –0.12).
Conclusion: The Danish version of the FABQ-PA is suitable for assessing fear-avoidance beliefs in groups of patients with SIS, but its ability to evaluate individual patients and changes over time may be more limited.
Keywords: outcome measures, validity, reliability, measurement error, responsiveness
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