iron deficiency was the most frequent cause of anemia ( 91.3 % ; 18.7 % of the total population ) , followed by bone marrow failure ( 6 % ; 1.2 % of the total population ) , hemolysis ( 2.2 % ; 0.5 % of the total population ) , and finally megaloblastic anemia ( 0.5 % ; 0.1 % of the total population ) .
C0030312
bone marrow failure
C0002888
megaloblastic anemia