Risk of illness, hospitalization and death in a cohort of blood donors in Italy.
OBJECTIVE
The aim of this study was to determine whether blood donors (BDs), compared with non blood donors (nBDs), present significant differences in risk of illness, hospitalization and death.


METHODS
All subjects included in the database of the Association of Voluntary Italian Blood Donors of Ferrara entered the study. The analysis only included residents who donated at least once. For each BD, four age- and sex-matched non-donor controls were selected from the master archive of the Province of Ferrara. Then, all hospitalizations of BDs and controls from January 2005 to December 2010 were extracted from the hospital admission and discharge database of the region.


RESULTS
During the considered period, 26,140 hospital admissions in BDs and 98,685 in controls were recorded; 11,862 individual BDs and 43,138 nBDs. Compared with controls, BDs were characterized by older age, lower average number of admissions and diagnoses, Charlson comorbidity index score, shorter hospital length-of-stay (LOS), lower mortality rates and higher age at death. Age at death was significantly higher for BDs with longer duration and higher number of donations. In particular, blood donation was not related to an increased risk of malignancies. The main limitation of this study is potential selection bias (i.e. a healthy donor effect). Matching with the control population also has its limitations.


CONCLUSIONS
This study confirms that BDs have a lower risk of hospitalization, and, more specifically, do not have an increased risk of malignancies, leukemias, lymphomas and myeloma.
Department of Internal Medicine, Hospital of Ferrara , Italy.
Massimo
M
Gallerani
Stefano
S
Volpato
Marcello
M
Cellini
Roberto
R
Reverberi
Dimitri P
DP
Mikhailidis
Roberto
R
Manfredini
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001782:Blood Donors / Q000706:statistics & numerical data*; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D007558:Italy / Q000453:epidemiology; D008297:Male; D016555:Matched-Pair Analysis; D008875:Middle Aged; D009026:Mortality; D009369:Neoplasms / Q000453:epidemiology / Q000209:etiology*; D012189:Retrospective Studies; D012307:Risk Factors; D055815:Young Adult
Blood donation; Hospitalization; Mortality; Risk of illness