Table 4.

Prediction of 30-day mortality on presentation in hospitalised patients with COVID-19 according to the point score in the derivation cohort and in the external validation cohort

Risk score	Derivation cohort					External validation cohort
	Total	30-day mortality				Total	30-day mortality
		Yes		No			Yes		No
		N	%	N	%		N	%	N	%
0	48	1	2.1	47	97.9	20	0	0.0	20	100
1	139	0	0.0	139	100	68	0	0.0	68	100
2	193	3	1.6	190	98.4	104	0	0.0	104	100
3	215	10	4.7	205	95.3	103	0	0.0	103	100
4	230	11	4.8	219	95.2	109	1	0.9	108	99.1
5	254	16	6.3	238	93.7	107	4	3.7	103	96.3
6	235	25	10.6	210	89.4	112	5	4.5	107	95.5
7	237	32	13.5	205	86.5	80	8	10.0	72	90.0
8	200	39	19.5	161	80.5	63	8	12.7	55	87.3
9	191	53	27.7	138	72.3	42	8	19.0	34	81.0
10	136	39	28.7	97	71.3	45	12	26.7	33	73.3
11	133	45	33.8	88	66.2	45	11	24.4	34	75.6
12	94	36	38.3	58	61.7	26	5	19.2	21	80.8
13	91	40	44.0	51	56.0	18	7	38.9	11	61.1
14	75	32	42.7	43	57.3	19	5	26.3	14	73.7
15	80	32	40.0	48	60.0	27	9	33.3	18	66.7
16	83	36	43.4	47	56.6	32	10	31.3	22	68.8
17	123	48	39.0	75	61.0	40	14	35.0	26	65.0
18	97	51	52.6	46	47.4	49	16	32.7	33	67.3
19	104	55	52.9	49	47.1	41	13	31.7	28	68.3
20	96	50	52.1	46	47.9	23	9	39.1	14	60.9
21	74	51	68.9	23	31.1	17	6	35.3	11	64.7
22	44	24	54.5	20	45.5	17	7	41.2	10	58.8
23	37	23	62.2	14	37.8	12	4	33.3	8	66.7
24	33	20	60.6	13	39.4	15	8	53.3	7	46.7
25	23	14	60.9	9	39.1	13	5	38.5	8	61.5
26	33	17	51.5	16	48.5	9	4	44.4	5	55.6
27	25	14	56.0	11	44.0	8	6	75.0	2	25.0
28	20	19	95.0	1	5.0	3	1	33.3	2	66.7
29	9	7	77.8	2	22.2	2	2	100	0	0.0
30	6	6	100	0	0.0	0	0	0.0	0	0.0
Total	3358	849	25.3	2509	74.7	1269	188	14.8	1081	85.2