Figure 3.

 (A) Probability plots of progression scores obtained from a three month clinical trial, in which sets of radiographs were scored with known time order (chronological; red) and with unknown time order (paired; blue). (B, C) Probability plots of progression scores obtained from a three month clinical trial in which sets of radiographs were scored with known time order (chronological; B) and with unknown time order (paired; C), stratified for the presence (blue) or absence (red) of radiographic damage at baseline.