Reason for blood product recalls. (A) Number of affected units per recall event attributed to different reasons for recall. Significance was estimated using Kruskal-Wallis test, P < 2.2 × 10⁻¹⁶. (B) Proportion of recall events attributed to different reasons for recall for class II and class III recall events. (C) Heat map of number of affected units for all reason for recall-product type combinations. Heat maps were constructed in R, using the heatmap.2() function in the gplots package.