eTable 1. Confirmed cases of SARS-CoV-2 in the participating districts from 1 March to 30 September 2020, age 18 years or older*¹.

Administrative district (inhabitants)	Total number of cases	Returned questionnaires	Gender	Age (years), n										Reported deaths among positive cases
				0–19	20–29	30–39	40–49	50–59	60–69	70–79	80–89	90–99	100+
Tübingen (228 678)			Female	10	155	105	122	163	91	51	75	34	2
			Male	13	129	105	74	148	83	52	54	9	0
			Other	0	1	0	0	0	0	0	0	0	0
	1476*2	756 (51.2%)		23	285	210	196	311	174	103	129	43	2	23
Enzkreis (199 556)			Female	8	126	101	121	125	56	34	48	29	1
			Male	17	162	124	109	124	52	27	22	4	0
			Other	0	1	0	1	0	0	0	0	0	0
	1292*3	423 (32.7%)		25	289	225	231	249	108	61	70	33	1	60
Reutlingen*5 (287 034)	1781*4	728 (40.9%)		334		227	240	385	218	135	170	72		82

*¹ All 4632 persons were contacted by mail and invited to participate in the study. Reported deaths during this period by district (e8). Numbers of inhabitants as of 31 December 2019 (www.wikipedia.org).

*² Including 73 letters that were returned undelivered

*³ Excluding 83 letters that were returned undelivered

*⁴ Including 84 letters that were returned undelivered

*⁵ No information on gender available