Table 1.

Definition of indicators used to characterize the SARS-CoV-2 epidemic across Italian regions.

Indicator domains	Abbreviations	Definitions
Temporal indicatorsa	d1	Days until first case detected
	d2	Days until first hospitalization occurred
	d3	Days until first patient was admitted to ICU
	d4	Days until first death occurred
	d5	Days until first patient recovered
	d6	Days to reach maximum number of new infections
	d7	Days to reach maximum number of hospitalized patients
	d8	Days to reach maximum number of ICU patients
Intensity indicators	i1	Number of cases on 24 February
	i2	Number of hospitalized patients on 24 February
	i3	Number of ICU patients on 24 February
	i4	Number of cases on 24 April
	i5	Number of new infections on 24 April
	i6	Number of positive patients on 24 April
	i7	Number of hospitalized patients on 24 April
	i8	Number of ICU patients on 24 April
	i9	Number of recovered patients on 24 April
	i10	Number of deaths on 24 April
Trend indicators	t1	Highest number of new infections
	t2	Highest number of hospitalized patients
	t3	Highest number of ICU patients
	t4	Greatest increment of hospitalized patients
	t5	Greatest increment of ICU patients
	t6	Greatest increment of recovered patients
	t7	Greatest increment of deaths
	t8	Increment of new infections on 24 April
	t9	Increment/decrementb of hospitalized patients on 24 April
	t10	Increment/decrementb of ICU patients on 24 April
	t11	Increment of deaths on 24 April
	t12	Increment of recovered patients on 24 April
Regional indicators	r1	Number of tests for SARS-CoV-2
	r2	Number of ICU beds
	r3	Number of residents
	r4	Mean age
	r5	Proportion of male
	r6	Aging index

ICU, Intensive Care Unit; SARS-CoV-2, Severe Acute Respiratory Syndrome Coronavirus 2.

^aTemporal indicators are computed as the number of days from 24 February, 2020.

^bThese indicators represent daily increment or decrement in relation to different regional scenarios on 24 April 2020.