aThe HBsAg new infection rate in repeat donors is the HBsAg+/HBc antibody- prevalence, and the incidence for HBV infections in first-time donors is equal to the incidence for HBV infections in repeat donors multiplied by the ratio of HBsAg new infection rate (the ratio of HBsAg new infection rate = HBsAg new infection rate of first-time donors over HBsAg new infection rate of repeat donors). The overall incidence for HBV infections in all donors is the percentage of incidence in first-time donors plus the percentage of incidence in repeat donors. For Hefei, 315.18 × 10−5 × 0.6226 (Number of first-times / number of first-times + number of repeats = 60,812 / 97,668) + 45.22 × 10−5 × 0.3774 = 196.23 × 10−5 + 17.07 × 10−5 = 213.3 × 10−5)