Figure 1

Bland and Altman plots (differences between examiner A and B measures (y-axis), and the mean of examiner A and B (x-axis) for each of the tests), with 95% limits of agreement (LOA) for the five tests (red lines). The green line (y = 0) is perfect average difference, and the purple line is the observed average difference (n = 38 for Sitting Knee Extension, n = 40 for the remaining tests; Leg Lowering in mm Hg, remaining tests in cm). Examiner A and B represent the examiners named A and B. Blue dots represent subjects without Low Back Pain (LBP), while red dots represent subjects with LBP on day of examination.