Table 5. Prevalence of haemoglobin modifiers observed in infants, north-western United Republic of Tanzania, February 2017–May 2018.

Chromosome	Gene	Single-nucleotide polymorphism	Allele change	Higher fetal haemoglobin allele frequency
2	BCL11A	rs1188686	T → C	0.322 = C
2	BCL11A	rs1427407	G → T	0.266 = T
2	BCL11A	rs4671393	G → A	0.325 = A
6	HBS1L-MYB	rs28384513	T → G	0.238 = G
6	HBS1L-MYB	rs9399137	T → C	0.045 = C
11	HBG2	rs7482144	G → A	0.000 = A