preferred_name: Percentage of a block group's population in households where the household income is less than or equal to twice the federal poverty level
preferred_name_lc: percentage of a block group's population in households where the household income is less than or equal to twice the federal poverty level
label: Percentage of a block group's population in households where the household income is less than or equal to twice the federal poverty level
label_lc: percentage of a block group's population in households where the household income is less than or equal to twice the federal poverty level