Fig. 6

Examination of the empirical patient flow. Arrows indicates patient flow going from a timestamp to a queue. 41,693 patients arrived at the ED. Of these 11,742 (28.2 %) patients got a triage score registered, 338 (0.8 %) patients did not get a triage score but did get a first TOKS score, and 29,613 (71.0 %) patients had neither triage nor TOKS values registered. Of the 11,742 patients that did get a triage score 4690 also got a first TOKS score. Thus, a total of 5028 (12.1 %) patients had a registered value for first TOKS. Only 3926 (9.4 %) patients had a registered value for all the factors in the idealised model for the patient flow. It was therefore decided to do the further analysis on the “black box” model with only arrival and departure as factors, until better completeness of the data could be obtained. Abbreviations: n, number of patients; arr, arrivals; tri, triage; to1, first TOKS; tol, last TOKS; dep, departure; Q, queue