© 1994 Oxford University Press
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Optimal Batch Size for Estimation of the Prevalence of a Disease Using Combined Samples

* Fuyang Hospital Zhejiang, People's Republic of China
** Hangzhou Occupational Disease Hospital
Zhejiang Provincial Hygiene and Epidemic Prevention Station
Great attention has been given to the combined sample test for its high efficiency.18 Here a model of mathematical expectation for combined samples has been worked out and used for Investigating the prevalence of HCV in serum from blood donors. It was shown that this model was valuable if the probability of a positive test, e.g. the prevalence, is less than 0.31.
Received 1 December 1993