the treatment oering a cholesterol test may be more attractive to individuals with
poor health status. High readings of cholesterol are associated with a host of adverse health
outcomes and behaviors, such as metabolic syndrome, high blood pressure, and fewer workouts
(Hata and Nakajima, 2000; Schmidt et al., 2008). Many of these correlates, in particular, high
blood pressure and its treatment, make rejections of donations more likely. Positive or negative
selectivity might result from applying the cholesterol test as an incentive, depending on whether
individuals with a good or a bad cholesterol reading nd the free test more attractive. Previous
evidence suggests that among blood donors, individuals with worse health status tend to seek