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Percentage of variant hemoglobins in newborns in northeastern capital cities
| City | Total Sample | Hb FAS | Hb FS | Year of survey |
| (%) | (%) | |||
| Teresina (PI) | 1034 | 3.8 | 0.5 | 2008-2009 |
| Salvador (BA)(6) | 590 | 9.8 | 0.2 | 2000 |
| Natal (RN)(7) | 1903 | 1.5 | 0.05 | 2001 |
| Fortaleza (CE)(8) | 389 | 3.8 | 0.2 | 2001-2002 |
| Recife (PE)(11) | 1998 | 5.1 | 0.2 | 1996-1997 |
| João Pessoa (PB)(10) | 1006 | 0.2 | - | 1993 |
Hb FS: homozygous for hemoglobin S; Hb FAS: sickle cell trait
