Study population
We identified 107 participants prescribed HU at the academic center and 65 participants from satellite clinics. The mean age (±s.d.) of the 172 participants was 11±5 years. Fifty two percent of participants were female; we did not identify a mean difference in sex of participants by clinic location (p=0.9). The mean (±s.d.) Hb was 8.5±1.1g/dL, MCV was 91.3±10.1 fL, HbF% was 12.7±6.7, and ANC was 4.9±2.3 x103/L. The mean poverty level of all the communities our participants live in was 18.1±4.2, the mean (±s.d.) median household income was 50,119±8,298, the mean percent of adults with less than a high school diploma was 13.5±3.9%, and the mean percent of adults with a high school diploma only was 29.1±5.0% (Table 1).