Table 2 Social Vulnerability Index’s variables characterizing census tracts

Social Vulnerability Index theme	Social vulnerability variable	Units
Theme 1: Socioeconomic Status	Below poverty line	Percentage of people
	Unemployed	Percentage of people
	Per capita income	Dollars
	No high school diploma	Percentage of people
Theme 2: Household Composition & Disability	Aged 65 or older	Percentage of people
	Aged 17 or younger	Percentage of people
	Civilian with a disability	Percentage of people
	Single-parent household	Percentage of households
Theme 3: Minority Status & Language	Minority (not non-Hispanic or Latino White)	Percentage of people
Theme 3: Minority Status & Language	Speaks English “less than well”	Percentage of people
Theme 4: Housing Type & Transportation	In multi-unit structures (ten or more units)	Percentage of households
	Mobile homes	Percentage of households
	Crowding (more people than rooms)	Percentage of households
	No vehicle access	Percentage of households
	Group quarters	Percentage of people

Notes: Information is from the Centers for Disease Control and Prevention³⁸ and Flanagan et al.³⁹. Each variable contributes equal weight to both its theme’s Social Vulnerability Index and the overall Social Vulnerability Index. See Supplementary Methods 3 for more details on the Social Vulnerability Index and its use in this study.

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