Ability to detect change
The ability of the PIB score to detect change was investigated by using the PGIC anchor to define change groups, while the ability of the Decision Tree score to detect change was evaluated by comparison with the CGIS anchor. The mean change score was assessed for the three groups of subjects. For the PIB score, the change score was negative (indicating an improvement in score) in the improved group (mean change score = −1.6) with a larger change compared to the stable population (mean change score = −0.3) (