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  • Title: Illness Perceptions Explain the Variance in Functional Disability, but Not Habitual Physical Activity, in Patients With Chronic Low Back Pain: A Cross-Sectional Study.
    Author: Leysen M, Nijs J, Van Wilgen CP, Struyf F, Meeus M, Fransen E, Demoulin C, Smeets RJEM, Roussel NA.
    Journal: Pain Pract; 2018 Apr; 18(4):523-531. PubMed ID: 28914487.
    Abstract:
    INTRODUCTION: Although the importance of psychosocial factors has been highlighted in many studies in patients with chronic low back pain (CLBP), there is a lack of research examining the role of illness perceptions in explaining functional disability and physical activity in patients with CLBP. AIM: The aim of the study was to explore the value of illness perceptions in explaining functional disability and physical activity in patients with CLBP. METHODS: Eighty-four participants with CLBP (of > 3 months' duration) completed a battery of questionnaires investigating psychosocial factors (Pain Catastrophizing Scale [PCS], Illness Perceptions Questionnaire Revised [IPQ-R], and 36-Item Short Form mental health scale [SF-36_MH]) and perceived pain intensity (visual analog scale [VAS]), as well as the Oswestry Disability Index (ODI) and Baecke questionnaire. The latter 2 were entered separately as dependent variables in a regression analysis. RESULTS: The combined variables (VAS, PCS, SF-36_MH, IPQ-R) accounted for 62% of the variance in functional disability (ODI). Adding the results of the IPQ-R to the scores of the other 3 variables (VAS, PCS, SF-36_MH) significantly increased the explained variance of ODI scores in CLBP patients, yielding 18% additional information (P < 0.01). Only 5% of the variance in the Baecke questionnaire was explained by combining the 4 variables. None of the single variables alone made a significant contribution to R². CONCLUSIONS: Illness perceptions are an important factor for explaining functional disability, but not for explaining habitual physical activity in CLBP patients.
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