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Br J Sports Med. 2019 Jul;53(13):825-834. doi: 10.1136/bjsports-2018-099450. Epub 2019 Jan 9.

Self-efficacy and risk of persistent shoulder pain: results of a Classification and Regression Tree (CART) analysis.

Author information

1
School of Health Sciences, Faculty of Medicine and Health Sciences, University of East Anglia, Norwich, UK.
2
Norwich Medical School, Faculty of Medicine and Health Sciences, University of East Anglia, Norwich, UK.
3
Department of Allied Health Professions, School of Health and Social Work, University of Hertfordshire, Hatfield, UK.

Abstract

OBJECTIVES:

To (i) identify predictors of outcome for the physiotherapy management of shoulder pain and (ii) enable clinicians to subgroup people into risk groups for persistent shoulder pain and disability.

METHODS:

1030 people aged ≥18 years, referred to physiotherapy for the management of musculoskeletal shoulder pain were recruited. 810 provided data at 6 months for 4 outcomes: Shoulder Pain and Disability Index (SPADI) (total score, pain subscale, disability subscale) and Quick Disability of the Arm, Shoulder and Hand (QuickDASH). 34 potential prognostic factors were used in this analysis.

RESULTS:

Four classification trees (prognostic pathways or decision trees) were created, one for each outcome. The most important predictor was baseline pain and/or disability: higher or lower baseline levels were associated with higher or lower levels at follow-up for all outcomes. One additional baseline factor split participants into four subgroups. For the SPADI trees, high pain self-efficacy reduced the likelihood of continued pain and disability. Notably, participants with low baseline pain but concomitant low pain self-efficacy had similar outcomes to patients with high baseline pain and high pain self-efficacy. Cut-off points for defining high and low pain self-efficacy differed according to baseline pain and disability. In the QuickDASH tree, the association between moderate baseline pain and disability with outcome was influenced by patient expectation: participants who expected to recover because of physiotherapy did better than those who expected no benefit.

CONCLUSIONS:

Patient expectation and pain self-efficacy are associated with clinical outcome. These clinical elements should be included at the first assessment and a low pain self-efficacy response considered as a target for treatment intervention.

KEYWORDS:

longitudinal study; observational study; physiotherapy; prospective; shoulder

Conflict of interest statement

Competing interests: RC had support from a National Institute of Health Clinical Doctoral Research Fellowship for the submitted work.

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