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Correlation between three assessment pain tools in subacromial pain syndrome

Objective: To compare the correlation of Visual Analog Scale with pain subsections of Shoulder Pain and Disability Index and Constant-Murley Score in subacromial pain syndrome patients. Design: Single cross-sectional analysis. Setting: Hospital Rehabilitation Department. Methods: The assessment tools were applied at baseline. Correlations between Visual Analog Scale, Shoulder Pain and Disability Index and Constant-Murley Score pain subsections were assessed by Pearson correlation coefficient. Linear regression models were calculated between scales. Statistical significance was set at two-sided p < 0.05. Results: Forty-three patients were included. Pearson’s correlation between assessments was for Visual Analog Scale-Shoulder Pain Disability Index-pain (r = 0.61, p < 0.001) and for Visual Analog Scale-Constant Murley Score-pain were (r = −0.74, p < 0.001). Visual Analog Scale-Shoulder Pain and Disability Index-pain determination coefficient was r2 = 0.37 and r2 = 0.54 for Visual Analog Scale-Constant-Murley Score-pain. Conclusions: Visual Analog Scale showed better correlation with Constant Murley Score-pain than with Shoulder Pain and Disability Index-pain in subacromial pain syndrome patients.