Table 2.

MAE, RMSE and ICC for agreement with actual driving time

		Cost-friction surface			OSRM			Google Maps
	n	MAE	RMSE	ICC	MAE	RMSE	ICC	MAE	RMSE	ICC
Total	385	53	64	−0.34	46	57	−0.19	14	21	0.85
Period of day
Weekend—morning	31	50	60	−0.39	44	54	−0.25	19	27	0.66
Weekend—afternoon	13	53	60	−0.51	47	54	−0.37	13	15	0.87
Weekend—evening	12	31	44	−0.05	25	38	0.18	5	9	0.98
Weekend—night	10	21	24	−0.38	13	19	−0.07	2	3	0.98
Weekday—morning	69	50	59	−0.29	44	52	−0.18	13	17	0.91
Weekday—afternoon	33	57	72	−0.37	51	66	−0.24	14	19	0.84
Weekday—evening	42	55	64	−0.29	49	58	−0.13	16	20	0.83
Weekday—night	19	61	76	−0.24	54	68	0.04	17	27	0.89
Could not tell	156	56	63	−0.44	49	56	−0.28	14	20	0.81
Referral status
Referred	132	68	78	−0.27	61	71	−0.36	16	21	0.86
Not referred	253	45	55	−0.48	39	49	−0.09	13	20	0.82
Driving time of replicated journey (min)
<30	92	13	15	−0.48	9	11	−0.12	4	5	0.78
30–60	131	41	42	−0.91	35	36	−0.86	11	13	0.21
60–120	132	75	77	−0.85	67	69	−0.80	19	25	0.45
>120	30	131	135	−0.88	120	124	−0.85	37	44	0.31
Google Maps driving distance estimate (km)
<5	91	18	23	−0.37	15	21	−0.20	7	11	0.60
5–10	93	41	45	−0.73	35	39	−0.64	13	17	0.42
10–20	101	56	59	−0.79	49	52	−0.73	15	21	0.38
>20	100	94	99	−0.77	84	91	−0.78	21	28	0.63

ICC, intraclass correlation coefficient; MAE, mean absolute error; OSRM, Open Source Routing Machine; RMSE, root mean square error.