The individual mean RPS range was 0.27–0.63. Elicited utilities for health state A and B ranged from 0.65 to 0.99 and 0–0.99. On five occasions negative utilities for health state B were obtained. Calculated RTB ranged from 0 to 0.99. Mean values, standard deviations (SD), medians and ranges are displayed in Table 1.
No statistically significant correlation between RPS and RTB was detected at the first ( P = 0.92; r s = 0.03) or second judgement ( P = 0.08; r s = −0.45).
Intrarater reliability over time is displayed graphically in Fig. 4 and the means, standard deviations (SD) and 95% limits of agreement are presented in Table 2.
No statistically significant systematic change between assessments was detected for RPS ( P = 0.43), health state A ( P = 0.45), health state B ( P = 0.66) or RTB ( P = 0.61).

Table 1. Results of RPS measurements, assessments of U-values for health states A and B and calculations of RTB.


Means, standard deviations (SD), medians and ranges are given.

Figure 4. Intraindividual stability of the Retreatment Preference Score (RPS) and retreatment benefit (RTB). Each square represents one decision maker.



Table 2. Results of intraindividual reliability assessments.


Means, standard deviations (SD) and 95% limits of agreement are given.