Table 1.

Attack rates (proportion by stratum) for the outcome ICU and death in period 1, and period 2, Portugal, March–December 2020 (n = 18,105).

	(unite cells)						Death
	Period 1 (March–September2020)			Period 2 (October–December 2020)			Period 1 (March–September2020)			Period 2 (October–December 2020)
Exposure	Total	ICU	%	Total	ICU	%	Total	Death	%	Total	Death	%
Sex
Female	4,440	387	8.72	4,153	208	5.01	4,440	815	18.36	4,153	887	21.36
Male	4,736	737	15.56	4,776	520	10.89	4,736	942	19.89	4,776	1,027	21.50
Age
0–49	1933	180	9.31	1,255	96	7.65	1933	35	1.81	1,255	20	1.59
50–59	1,058	183	17.30	1,040	127	12.21	1,058	64	6.05	1,040	57	5.48
60–69	1,457	300	20.59	1,572	233	14.82	1,457	173	11.87	1,572	176	11.20
70–79	1722	298	17.31	1983	195	9.83	1722	393	22.82	1983	430	21.68
80–89	2,136	148	6.93	2,278	75	3.29	2,136	710	33.24	2,278	845	37.09
≥90	870	15	1.72	801	2	0.25	870	382	43.91	801	386	48.19
Comorbidities
Malignant neoplasm	795	88	11.07	609	33	5.42	795	288	36.23	609	237	38.92
Metastatic cancer	91	5	5.49	55	0	0.00	91	44	48.35	55	29	52.73
Mental illness	2,138	356	16.65	1977	186	9.41	2,138	419	19.60	1977	393	19.88
Pregnancy	367	7	1.91	265	5	1.89	367	1	0.27	265	3	1.13
Cardiac disease (heart failure)	1,607	174	10.83	1,515	101	6.67	1,607	548	34.10	1,515	534	35.25
Chronic kidney disease (renal failure)	1,521	162	10.65	1,326	61	4.60	1,521	446	29.32	1,326	447	33.71
Chronic pulmonary disease	666	112	16.82	768	59	7.68	666	173	25.98	768	201	26.17
Asthma	309	45	14.56	339	41	12.09	309	36	11.65	339	34	10.03
Chronic liver disease	661	156	23.60	624	78	12.50	661	136	20.57	624	149	23.88
Obesity	1811	362	19.99	2,130	247	11.60	1811	312	17.23	2,130	414	19.44
Dementia	1,387	40	2.88	1,203	12	1.00	1,387	496	35.76	1,203	524	43.56
Hypertension	2,588	300	11.59	2,649	220	8.31	2,588	678	26.20	2,649	754	28.46
Diabetes	2069	279	13.48	2,191	178	8.12	2069	471	22.76	2,191	573	26.15
Neurologic disease	561	77	13.73	509	23	4.52	561	175	31.19	509	177	34.77
Total	9,176	1,124	12.25	8,929	728	8.15	9,176	1757	19.15	8,929	1914	21.44