Table 1. Summary data for both patient populations.

		Tanzanian patients	British patients
N	HbS/HbS	529 female, 516 male	82 female, 64 male
	HbS/β0	0	2 female, 3 male
Age, y	Median	13	29
	Range	5-45	11-64
HbF	Geometric mean, %	4.40	5.60
	Interquartile range, %	2.7-7.8	3.2-10.3