Table 1.

Selection criteria for primary studies to enter the present meta-analysis

P (Population)	E (Exposure)	C (Comparison)	O (Outcomes)	T (Type of Studies)
The target population included all pregnant women without any restrictions	The intended exposure or cause was the presence of infection or hepatitis B virus in pregnant women	The comparison group included healthy pregnant women without hepatitis B infection	The intended Outcomes included neonatal death, miscarriage, eclampsia or preeclampsia, preterm birth, gestational diabetes, and other outcomes reported in selected cohort studies	The type of studies included only cohort studies