Fig. 2
Maximum acceptable waiting time in weeks as assessed based on referral information (x-axis) and based on information from patient consultation (y-axis). The size of the plots indicates the number of observations. The colour indicates the percentage of high-quality referral letters from red (no referral letters with scores exceeding 7 on a 0–16 point scale) to green (the referral letter quality exceeds 7 in all cases)