EV concentrations according to blood donor characteristics in RBC units prepared at the Strasbourg center (n = 264). (A) PEV and EEV counts according to donor blood group. Mean and SD are presented. ***P < 0.0001, **P < 0.001, with Mann-Whitney U test. A group = 113 units; B = 20; O = 110; AB = 22. (B) PEV and EEV counts according to donor sex. Mean and SD are presented. The Student t test was not significant (NS). Female (F) donors, n = 108. Male (M) donors, n = 156 units. (C) PEV and EEV counts according to donor age and sex. (D) EEV counts according to donor erythrocyte count.