Display is based on the estimated low birth weight rate (liveborn infants weighing <2500 grams or <5.5 pounds per 100 total live births) in a ZCTA.
HRSA Area Resource File, 2014-2016 (2017-2018 data release)
U.S. Census Bureau block level population data, 2010
Next Planned Update
Where It’s Found in the UDS Mapper
Explore Service Area Tool: Data Table, Additional Population Data and Indicators
Imputed to the ZCTA level. See an explanation of the methodology here: https://udsmapper.org/data-estimation-methodologies/