Table 4 Odds ratios for HBV infection based on the combination of sex and birth date

 Born before July 1986, women

1

 Born before July 1986, men

1.44 (1.37–1.52)

< 0.001

 Born after July 1986, women

0.17 (0.14–0.22)

< 0.001

 Born after July 1986, men

0.21 (0.17–0.26)

< 0.001

 17–29

1

 30–65

1.65 (1.34–2.04)

< 0.001

 A

1

 B

0.96 (0.91–1.02)

0.206

 O

1.02 (0.97–1.07)

0.527

 AB

0.97 (0.88–1.07)

0.580

  ≤ 24 kg/m²

1

  > 24 kg/m²

1.08 (1.03–1.13)

0.001

ALT (U/L)

1.01 (1.01–1.01)

< 0.001

 Northern

1

 North-Central

1.16 (1.08–1.24)

< 0.001

 Central

1.28 (1.21–1.36)

< 0.001

 Central-South

1.39 (1.30–1.49)

< 0.001

 Southern

1.25 (1.16–1.33)

< 0.001

 Eastern

1.41 (1.22–1.61)

< 0.001

 Island

1.03 (0.74–1.43)

0.872

 Service worker

1

 Student

0.29 (0.26–0.32)

< 0.001

 Military/civil servant/teacher

0.70 (0.64–0.77)

< 0.001

 Laborer/farmer and fisherman

1.02 (0.96–1.09)

0.505

 Business/technician/specialist

0.76 (0.71–0.83)

< 0.001

 Others (including housekeepers)

0.94 (0.88–0.99)

0.044