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The source states: "We define hesitancy as those respondents who indicate that they are “unsure” or would “probably not” or “definitely not” get a COVID-19 vaccine (our binary measure equal to one). Those answering “yes” to being vaccinated are therefore treated as not hesitant (our binary measure is equal to zero), as are those who responded “definitely” or “probably” as to their intent to get vaccinated."

"Essential Healthcare: Respondent works in a healthcare setting that was classified by CDC as phase 1(a). This includes all paid and unpaid persons who are at highest risk of exposure given the potential for direct or indirect exposure to patients or infectious materials. This includes persons not directly involved in patient care, but potentially exposed to infectious agents while working in a healthcare setting. Frontline healthcare workers, including those working or volunteering in a hospital, nursing or residential healthcare facility, are in this category. Other workers in this category include those working in pharmacy, and ambulatory healthcare."

"Essential Non-healthcare: Respondent works in a setting that was classified by CDC as phase 1(b) or 1(c). This includes the subset of workers likely at medium risk for work-related exposure to SARS-CoV-2 because their work-related duties must be performed on-site and involve being in close proximity (less than 6 feet) to the public or to coworkers. This category includes social service workers,25 first respondents, correctional facility workers, grocery store workers, workers in certain manufacturing and service industries (e.g., energy, food, chemical), public transit workers, workers of schools and other instructional facilities, and postal service workers."

"Non-essential: Respondent works in setting that was classified by CDC as phase 2, or not included anywhere else. This includes workers likely at low risk of work-related exposure to SARS-CoV-2."