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Table 3 Multiple regressions between HBsAg status and preterm labor stratified by maternal age

From: Maternal age and educational level modify the association between chronic hepatitis B infection and preterm labor

Variable

Age < 30

Age ≥ 30

OR (95% CI)

P-value

OR (95% CI)

P-value

HBsAg

1.60 (1.03–2.49)

0.036

0.83 (0.57–1.22)

0.346

Education level

0.60 (0.37–0.97)

0.037

1.08 (0.67–1.76)

0.746

Pre-pregnancy BMI

1.06 (0.97–1.15)

0.200

1.02 (0.96–1.09)

0.486

GWG

0.97 (0.93–1.00)

0.058

0.99 (0.96–1.02)

0.332

  1. Abbreviation: OR Odds ratio, CI Confidence interval, BMI Body mass index, GWG Gestational weight gain