Table 2. Estimated epidemic doubling time and R₀ in selected regions, Italy, 28 January–31 March 2020 (n = 43,625 cases with a date of symptom onset).

Region	Adjusted AR classification	Doubling time (days)	95% CI	R₀	95% CI
Lombardy	High	2.7	2.2–3.5	2.96	2.73–3.17
Veneto	Intermediate	3.2	2.5–4.2	2.51	2.18–2.86
Emilia-Romagna	High	2.7	2.3–3.3	2.84	2.57–3.13
Tuscany	Intermediate	3.2	2.3–5.2	2.50	2.18–2.83
Lazio	Intermediate	2.9	2.2–4.3	3.00	2.68–3.33
Apulia	Intermediate	2.9	2.2–4.3	2.61	2.13–3.13

AR: attack rate; CI: confidence interval; R₀: basic reproduction number.

Table 2. Estimated epidemic doubling time and R0 in selected regions, Italy, 28 January–31 March 2020 (n = 43,625 cases with a date of symptom onset).