Age-related donor return patterns among first-time blood donors in the United States.
BACKGROUND
Committed repeat donors are vital to the continued success of blood collections, yet the effect of age of first-time (FT) donation on return behavior is poorly described. Sixteen-year-old donors are increasingly allowed to donate and have the highest rates of adverse events, which negatively impacts return behavior.


METHODS
Annual cohorts of allogeneic FT donors from 2005 and 2006 were selected within the American Red Cross system and followed for 25 and 13 months, respectively. Return and total yield rates among different age groups were compared.


RESULTS
A total of 2.3 million FT donors from 2005 and 2006 gave 4.2 million donations during the study. Sixteen- to 19-year old FT donors made up 41% of the FT donor base in 2005 and 16-, 17-, 18-, and 19-year-olds, respectively, had initial return rates of 62, 52, 35, and 28% and yield rates of 2.0, 1.76, 1.51, and 1.41 over 13 months. Multivariate analysis of FT yield rates shows that younger (16 and 17 years) and older (50+ years) donors, males, blood group O donors, and those without any initial adverse reaction are most likely to return. Increasing severity of donor adverse reactions correlated with a reduction in yield and return rates.


CONCLUSIONS
FT 16-year-old donors had the highest return and yield rates despite the negative impact of increased adverse event rates. Donation at young age is critical to building a cadre of committed repeat donors but donor reactions must be addressed to ensure the donors' well-being and to sustain return behavior.
Notari
Edward P
EP
Transmissible Diseases Department, Jerome H. Holland Laboratory for Biomedical Sciences, American Red Cross Biomedical Services, Rockville, Maryland 20855, USA. notarie@usa.redcross.org
Zou
Shimian
S
Fang
Chyang T
CT
Eder
Anne F
AF
Benjamin
Richard J
RJ
Dodd
Roger Y
RY
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001782:Blood Donors / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D014481:United States; D055815:Young Adult