Association between environmental markers of poor food access and number of hospitalizations. The x-axis is the percentage of households with children who live >1 mile from a supermarket (A) and the number of housing units without vehicles located >0.5 miles from a supermarket (B). The analysis was subdivided based on 3 cutoff points: 10%, 20%, and 30%. The y-axis is the square root of the estimated number of hospitalizations up to 3 years (A) and 6 years (B) per 100-patient-year. P values were calculated using the generalized linear model (GLM), with adjustment for hydroxyurea exposure, chronic transfusions, and SCD genotype, by analyzing the categorized environmental variable as a dose effect of 0, 1, 2, and 3.