Abstract Background We aimed to investigate whether maternal chronic hepatitis B virus (HBV) infection affects preterm birth (PTB) in pregnant women. Methods retrospectively analyzed HBV-infected and non-infected women attending antenatal care at Fujian Maternity Child Health Hospital, Fuzhou, China between January 1, 2016 December 31, 2018. Participants were divided into HBV ( n = 1302) contro...