Differences between observers, plotted against the mean values of both observers for each patient for passive extension

<p><b>Copyright information:</b></p><p>Taken from "Reproducibility of goniometric measurement of the knee in the in-hospital phase following total knee arthroplasty"</p><p>http://www.biomedcentral.com/1471-2474/8/83</p><p>BMC Musculoskeletal Disorders 2007;8():83-83.</p><p>Published online 17 Aug 2007</p><p>PMCID:PMC2040146.</p><p></p> The figure shows the mean difference between observers (solid line at centre) and the limits of agreement (dashed outer lines corresponding to ±1.96 SD of the mean difference between the first and second observers)