Table 3.

Time intervals between key events as estimated from laboratory confirmed infections ascertained in Lombardy between February 20 and July 16, 2020.

Median days (IQR)
	Time between symptom onset and diagnosis of SARS-CoV-2	Time between symptom onset and death	Time between symptom onset and hospital admission	Time between symptom onset and ICU admission	Time between hospital and ICU admission	Hospital length of stay	ICU length of stay
Age
0–39	3 (0–11)	16 (6–27)	4 (1–8)	8 (4–11)	1 (0–5)	4 (0–10)	9 (4–15.75)
40–59	5 (1–11)	15 (9–26)	6 (2–10)	10 (6–13)	2 (0–6)	9 (1–18)	11 (6–19)
60–69	5 (1–10)	16 (9–25)	6 (2–10)	11 (7–15)	3 (0–7)	13 (6–24)	12 (6–20)
70–79	5 (1–9)	12 (7–20)	5 (2–9)	10 (6–16)	4 (1–7)	12 (5–24)	10 (5–18)
≥ 80	3 (0–8)	11 (6–19)	4 (1–8)	9 (4–23)	2 (0–11.5)	10 (4–24)	5 (3–10.75)
Unknown	13 (9.5–16.5)	0 (0–0)	8 (8–8)	8 (8–8)	0 (0–0)	14 (14–14)	14 (14–14)
Epidemic period
Before 16 March	7 (3–12)	13 (8–21)	7 (3–10)	10 (7–15)	3 (0–6)	10 (3–21)	11 (6–19)
After 16 March	2 (0–7)	11 (6–20)	3 (1–7)	9.5 (5–14)	4 (0–8)	10 (3–23)	11 (6–20)
Unknown	0 (0–0)	0 (0–0)	0 (0–0)	0 (0–0)	0 (0–4)	8 (2–20)	6 (3.75–13)
Overall	4 (1–10)	12 (7–21)	5 (2–9)	10 (6–15)	3 (0–6)	10 (3–21)	11 (6–19)
Estimates obtained by fitting a negative binomial distribution to observed data
overdispersion	0.445	1.638	0.831	2.036	0.57	0.746	1.517
mean	9.753	16.105	7.385	12.159	5.309	15.54	14.614