Fig. 2From: Evaluating of the association between ABO blood groups and coronavirus disease 2019 (COVID-19) in Iraqi patientsCoronavirus disease 2019 cases and control distributed according to mean age. Different uppercase letters represent significant difference between means of bars (p value < 0.001), while similar letters represent no significant difference between means of bars (p value > 0.05) (Duncan multiple range test)Back to article page