Average pain reported by donors.

Shown is the mean (± 95% confidence intervals) for the average pain reported by marrow (●) or PBSC (○) donors at varying times during the donation procedures. Day 0 is the day of HSC infusion. Day −3 is the third day of filgrastim administration for PBSC donors; day −1 is the fifth day of filgrastim administration and the first day of apheresis. If the confidence intervals do not overlap, the group means differ significantly (P < .05) at that time point.