Characteristics at Enrollment and Survival Status Based On Hydroxyurea Status and Fetal Hemoglobin Quartiles in Patients with HbSS.

at-testbChi-square testcCox regression with age as the time-scaledWilcoxon rank-sum testN/ANot applicableeHydroxyurea doses >35 mg/kg/d are not FDA-approved for the general management of patients with sickle cell anemia and were usually used in patients in preparation for hematopoietic stem cell transplantation.fMean maximum HbF and MCV are defined as the mean calculation of the highest values observed for each subject.*p**p#p##pCharacteristics at Enrollment and Survival Status Based On Hydroxyurea Status and Fetal Hemoglobin Quartiles in Patients with HbSS.