Fig. 2
From: Risk classification of patients referred to secondary care for low back pain
Agreement between STarT Back screening tool and Örebro Musculoskeletal Pain Screening Questionnaire (ÖMPSQ). Dotted lines in the Bland-Altman plot represent mean bias with 95% limits of agreement. The solid diagonal line represent the difference between the screening tools regressed on the average of the two tools (slope = − 0.58). X-axis displays average percentage score between both instruments. Y-axis display differences in percentage score