After adjusting for measured confounders , factors associated with increased risk of anaemia in pregnancy were malaria infection ( OR : 1.32 , 95 % CI : 1.11 , 1.58 ) , Human Immuno-deficiency Virus infection ( OR : 2.13 , 95 % CI : 1.36 , 2.90 ) and lack of iron supplementation ( OR : 1.66 , 95 % CI : 1.36 , 2.03 ) .