Table 4

Accuracy of predictions (MAPE), sensitivity and accuracy between observed and predicted high ED demand in January 2020 (the operating period of the Ws) with a 1-day (A) and 2-day (B) horizon

	MAPE	Accuracy (%)	Observed high ED demand	Predicted high ED demand (%, sensitivity)
	MAPE	Accuracy (%)	Observed high ED demand	Green	Yellow	Red
(A)
Hospital A	7.8	52	Green	94	6	0
			Yellow	100	0	0
			Red	71	29	0
Hospital B	7.8	81	Green	87	13	0
			Yellow	0	100	0
			Red	17	17	67
Hospital C	8.6	52	Green	100	0	0
			Yellow	67	33	0
			Red	73	27	0
Hospital D	6.6	45	Green	55	36	9
			Yellow	0	33	67
			Red	50	33	17
Hospital E	11	45	Green	100	0	0
			Yellow	100	0	0
			Red	92	8	0
(B)
Hospital A	8.1	55	Green	100	0	0
			Yellow	100	0	0
			Red	71	29	0
Hospital B	8.6	71	Green	73	27	0
			Yellow	0	100	0
			Red	25	17	58
Hospital C	9	45	Green	93	7	0
			Yellow	83	17	0
			Red	82	18	0
Hospital D	7.6	48	Green	50	18	32
			Yellow	0	0	100
			Red	33	0	67
Hospital E	11.2	45	Green	100	0	0
			Yellow	100	0	0
			Red	92	8	0

.ED, emergency department; MAPE, mean absolute percentage error.