Figure 2
From: Validation of a proposed WOMAC short form for patients with hip osteoarthritis
The Bland-Altman plot shows the difference in the WOMAC long and short function scales plotted against the mean value of these two scales. The three horizontal lines indicate the mean individual differences d ± 1.96 SD (limits of agreement). The mean (SD) of the WOMAC long and short function scales at baseline were 65.19 (16.61) and 68.36 (17.29), respectively. The mean (SD) of the difference between both scales was -3.15 (4.90). Limit of agreement: -12.75 to 6.45.