Table 1.

State-level policy data in the US.

Policy	Description	Stringency
School closure	A report of the closing of schools and universities beginning in Ohio on 12 March 2020 [19]	0—no measurement 1—recommended 2—required
Workplace closure	A report of the closing of places of work. 19 March 2020 was the beginning of workplace closures in the US [7]	0—no measurement 1—recommended 2—required
Public event cancellation	A report of the cancellation of public events in a state. By 6 March 2020 some music festivals had been canceled [19]	0—no measurement 1—recommended 2—required
Public transport closure	A report of the closing of public transportation. Transport closures were recommended by 17 March 2020 [7]	0—no measurement 1—recommended 2—required
Public information campaign	Implementations of state-level public information campaigns regarding COVID-19. Public information campaigns started to be put in place by 16 March 2020 [7]	0—no campaign 1—campaign held
Stay-at-home order	Stay-at-home orders were collected for the category of internal movement restrictions. The 15 March 2020 marked the beginning of stay-at-home orders for non-essential workers in the US [7]	0—no measurement 1—recommended 2—required
International/national travel control	A record of international/national travel controls. On 30 January 2020 the US started implementing COVID-19 related travel advisories [19]	0—no measure 1—screening 2—quarantine on high risk regions 3—ban on high risk regions