The institute looked at three years of city of Chicago crime data and census demographic reports to estimate the number of children under the age of five 5 living in community areas with a greater-than-median number of homicides. The association was most stark in the Austin neighborhood, which, according to the Erikson study, had the most homicides of any community area in 2018 and the most children under the age of 5 in 2017, the most recent years with available data.