Figure 2

Distribution of health states at baseline and at endpoint of the 1-year study. Numbers of patients evaluated were 471 at baseline and 474 at endpoint. This figure illustrates both the floor effects of the measurement model as well as its descriptive validity: the percentage of patients in health state 2 shifted to a higher level of health in state 1 at the study endpoint. *P < 0.001 vs baseline, McNemar's test.