Table 1 The demographic data of HBsAg positive group and HBsAg negative group

Age (years)

32 (30,36)

32 (30,36)

> 0.999

BMI (kg/m²)

21.45 (19.65,23.73)

21.41 (19.78,23.56)

0.895

Duration of infertility (years)

3 (2,6)

3 (2,5)

< 0.001

Types of infertility

0.086

Proportion of secondary infertility (%)

876 (55.65%)

828 (52.6%)

Proportion of primary infertility (%)

698 (44.35%)

746 (47.4%)