| Ex. ECO-B-106 | Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2020-2021 academic year'State-by-State chronology of 2020-21 reopening orders, statewide closures (Kentucky Nov. 23, 2020; Michigan Nov. 18, 2020), in-person… | Ballotpedia (secondary source; Burbio data) | United States (50 States and D.C.)Other | July 8, 2021 | 2020 Q32020 Q42021 Q12021 Q2 | Schools and child care | Confirmed from a secondary source | |
| Ex. ECO-B-105 | Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2019-2020 academic year'State-by-State chronology of spring 2020 school closure orders and announcements, with total students affected per State (NCES) | Ballotpedia (secondary source; student counts from NCES) | United States (50 States and D.C.)Other | June 30, 2020 | 2020 Q2 | Schools and child care | Confirmed from a secondary source | |
| Ex. ECO-B-107 | Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2021-2022 academic year'State-by-State table of 2021-22 school mask requirements and bans (instrument type and end date) and teacher/staff vaccination requirements… | Ballotpedia (secondary source) | United States (50 States and D.C.)Other | Aug. 1, 2022 | 2021 Q3 | Face-covering requirementSchools and child careVaccination or testing | Confirmed from a secondary source | |
| Ex. ECO-B-108 | Ballotpedia, 'State employee vaccine requirements during the coronavirus (COVID-19) pandemic, 2021-2023'State-by-State table of vaccination or testing requirements for State employees announced July 26 - September 2021 with effective dates (CA… | Ballotpedia (secondary source) | United States (50 States)Other | Dec. 31, 2021 | 2021 Q3 | Workplace rulesVaccination or testing | Confirmed from a secondary source | |
| Ex. SEC-15-001 | School responses to the coronavirus (COVID-19) pandemic during the 2019-2020 academic year (State-by-State closure chronology)School responses to the coronavirus (COVID-19) pandemic during the 2019-2020 academic year | Ballotpedia (Lucy Burns Institute) | United States (fifty States)Other | June 30, 2020 | 2020 Q2 | Schools and child care | Confirmed from a secondary source | |
| Ex. SEC-15-002 | School responses to the coronavirus (COVID-19) pandemic during the 2020-2021 academic year (State reopening regimes, mid-year closures, return orders, monthly status)School responses to the coronavirus (COVID-19) pandemic during the 2020-2021 academic year | Ballotpedia | United States (fifty States)Other | June 30, 2021 | 2020 Q32020 Q42021 Q12021 Q2 | Face-covering requirementSchools and child careEvents and venues | Confirmed from a secondary source | |
| Ex. SEC-15-003 | School responses to the coronavirus (COVID-19) pandemic during the 2021-2022 academic year (school mask requirements and bans, staff and student vaccine requirements, litigation)School responses to the coronavirus (COVID-19) pandemic during the 2021-2022 academic year | Ballotpedia | United States (fifty States)Other | Aug. 1, 2022 | 2021 Q3 | Face-covering requirementSchools and child careVaccination or testingQuarantine and isolation | Confirmed from a secondary source | |