Peripheral blood CD34⁺ cell count after G-CSF administration (10 μg/kg per day) versus weight and age according to donor self-described ethnicity. Peripheral blood CD34⁺ cell counts after G-CSF administration were strongly associated with weight in all ethnic groups. When plotted against donor weight (A), CD34⁺ cell counts were highest in donors who were Asian/Pacific (◇, short alternating with long dashed line), followed by blacks (▲, dashed line), Hispanic (●, dotted line), and then whites (□, solid line). There was a modest, negative association of CD34⁺ cell counts when plotted vs donor age (B); the lowest values were observed in white donors and higher values in those who were black, Hispanic, or Asian/Pacific.