• J Pain · Jan 2017

    Randomized Controlled Trial

    Identifying Treatment Effect Modifiers in the STarT Back Trial: A Secondary Analysis.

    • Jason M Beneciuk, Jonathan C Hill, Paul Campbell, Ebenezer Afolabi, Steven Z George, Kate M Dunn, and Nadine E Foster.
    • Department of Physical Therapy, University of Florida, Gainesville, Florida; Brooks Rehabilitation-College of Public Health and Health Professions (University of Florida) Research Collaboration, University of Florida, Gainesville, Florida. Electronic address: beneciuk@phhp.ufl.edu.
    • J Pain. 2017 Jan 1; 18 (1): 54-65.

    AbstractIdentification of patient characteristics influencing treatment outcomes is a top low back pain (LBP) research priority. Results from the STarT Back trial support the effectiveness of prognostic stratified care for LBP compared with current best care, however, patient characteristics associated with treatment response have not yet been explored. The purpose of this secondary analysis was to identify treatment effect modifiers within the STarT Back trial at 4-month follow-up (n = 688). Treatment response was dichotomized using back-specific physical disability measured using the Roland-Morris Disability Questionnaire (≥7). Candidate modifiers were identified using previous literature and evaluated using logistic regression with statistical interaction terms to provide preliminary evidence of treatment effect modification. Socioeconomic status (SES) was identified as an effect modifier for disability outcomes (odds ratio [OR] = 1.71, P = .028). High SES patients receiving prognostic stratified care were 2.5 times less likely to have a poor outcome compared with low SES patients receiving best current care (OR = .40, P = .006). Education level (OR = 1.33, P = .109) and number of pain medications (OR = .64, P = .140) met our criteria for effect modification with weaker evidence (.20 > P ≥ .05). These findings provide preliminary evidence for SES, education, and number of pain medications as treatment effect modifiers of prognostic stratified care delivered in the STarT Back Trial.Copyright © 2016 American Pain Society. Published by Elsevier Inc. All rights reserved.

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