Hb phenotype

Haptoglobin phenotype

non Hp 1-1

Hp 1-1

SAFA₂, SFA₂, SC

(Heterozygous sickle cell disease, sickle thalassemia)

Categorical morbidity

≤5

Effective

78

15

% within categorical morbidity

83.9%

16.1%

>5

Effective

8

7

% within categorical morbidity

53.3%

46.7%

SSFA₂

(Homozygous sickle cell disease)

Categorical morbidity

≤5

Effective

31

16

% within categorical morbidity

66.0%

34.0%

>5

Effective

12

3

% within categorical morbidity

80.0%

20.0%