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Table 3 Prevalence of HBsAg in first-time donors born before and after 1992 tested at the same ages

From: Prevalence of hepatitis B surface antigen (HBsAg) in a blood donor population born prior to and after implementation of universal HBV vaccination in Shenzhen, China

Age year Born <1992 Born ≥ 1992 Overall P value
HBsAg+/total % HBsAg+/total % HBsAg+/total % inter-group
18 152/4600 3.30 162/5151 3.15 314/9751 3.22 0.656
19 373/10,158 3.67 280/8212 3.41 653/18,370 3.55 0.340
20 545/14,797 3.68 253/6029 4.20 798/20,826 3.83 0.080
21 612/17,982 3.40 191/3833 4.98 803/21,815 3.68 0.000
22 692/20,146 3.43 99/2097 4.72 791/22,243 3.56 0.002
All ages 2374/67,683 3.51 985/25,322 3.89 3359/93,005 3.61 0.005
  1. Intra-population of first-time donors, P = 0.228–0.74 from 18 v.s. 20, 21 or 22 years born <1992; P = 0.003–0.0001, 18 v.s. 21, or 22 years born ≥1992