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Table 4 Incidence of HBsAg seroconversion in repeat 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 1/490 0.20 0/318 <0.01 1/808 0.12 0.606
19 16/2042 0.78 5/1283 0.39 21/3325 0.63 0.163
20 26/4126 0.63 6/1620 0.37 32/5746 0.56 0.234
21 30/5868 0.51 1/1262 0.08 31/7130 0.43 0.034
22 43/7779 0.55 2/630 0.32 45/8409 0.54 0.334
All ages 116/20,305 0.57 14/5113 0.27 130/25,418 0.51 0.008
  1. Intra-population of repeat donors, P = 0.202–0.298 from 18 v.s. 20, 21, or 22 years born <1992; P = 0.341–0.441from 18 v.s. 21 or 22 years born ≥1992