Fig. 3

Percentage of referrals with a QRef-MH score between 0 and 7, or between 8 and 16, and assessments of maximum acceptable waiting time, either indicating that the patient received a priority that was too low (left-hand side) or too high (right-hand side). The mean difference in weeks (solid lines) and the ± 1 SD interval (dotted line) were estimated using a Nadaraya-Watson kernel estimator with a bandwidth of 5 and 3 weeks. Dots indicate observations