Table 1.

Baseline clinical and laboratory variables in 1193 SCD patients

Variable	Value
Age at first encounter, median (IQR), y	24 (17-35)
Sex, male/female, n (%)	515 (43.2)/678 (56.8)
Race, African American, n (%)	1123 (94.1)
Sickle cell genotype, n (%)
HbSS/SB0-thalassemia	831 (69.7)
HbSC	290 (24.3)
HbSB+-thalassemia	69 (5.8)
Other	3 (0.3)
Hydroxyurea by sickle cell genotype, n/N (%)
Total	659/1193 (55.2)
HbSS/SB0- thalassemia	560/831 (67.4)
HbSC	77/290 (26.6)
HbSB+-thalassemia	22/69 (31.9)
Other	0/3 (0)