Impact of residual platelet count on PEV concentration in RBC units prepared at the BES center (n = 648). (A) Platelet (PLT) count in RBC units according to filter type: Fresenius (Fr)-WBf (n = 91), MacoPharma (M)-WBf (n = 53), Fenwal (Fe)-WBf (n = 211), Fe-RBCf (n = 261), and M-RBCf (n = 15) filters in the Bourgogne Franche-Comté center. Each circle represents a unit, and the means with SD are presented as black lines. (B) Pearson correlation for PLT and PEV concentration. (C) PEV counts in RBC units according to filter type: Fr-WBf (n = 13), M-WBf (n = 16), Fe-WBf (n = 204), Fe-RBCf (n = 258), and M-RBCf (n = 15) filters in the Bourgogne Franche-Comté center, for units with very low residual platelet levels (<5 × 10⁹/L) prepared in BES. For all panels, each horizontal bar reports a mean, and each vertical bar, the SD. ***P < .0001 and **P < .001 according to Student t test.