Humoral and cellular immune responses to SARS-CoV-2 vaccination among HSCT recipients. Dark horizontal lines indicate medians; colored dots, weighted means; boxes, interquartile ranges (IQRs); whiskers, ranges. Only data in the allogeneic HSCT group are available in some models (indicated by ^a). Because of <5 included studies, some box plots cannot be graphed (indicated by ^b).