| Sickle Cell | Alpha-thal | Beta-thal |
African American | 1/12 | 1/30 | 1/75 |
Caribbean | 1/12 | 1/30 | 1/50-75 |
Asian | * | 1/20 | 1/50 |
Southeast Asian | * | >1/20 | 1/30 |
Central America | 1/30-200 | ** | 1/30-50 |
Mediterranean | 1/30-50 | 1/30-50 | 1/20-30 |
Middle Eastern | 1/50-100 | ** | 1/50 |
*Rare **Variable Risk