CI indicates confidence interval.
*One-sided 97.5% CI.
†This estimate of HCV prevalence among B-cell lymphoma may be biased. Indeed, ∼550 additional lymphoma patients seen in the same period were not tested for HCV at diagnosis. Most likely, patients with an expected increased risk for the infection (eg, those from endemic countries, those with a history of blood transfusions or of intravenous use of drugs, and those with elevate transaminases or a history of liver disease) were tested more frequently than the others, leading to a potential overestimation of the HCV prevalence.