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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