Gravidity, smoking and illegal drug use during pregnancy, BMI, systolic and diastolic blood pressure at enrolment were negatively associated with level of education (P for trend <0.05).

Gravidity, previous ectopic pregnancy, gestational age, beta-human chorionic gonadotropin (beta-hCG) level, number of methotrexate treatments and the presence of a visible yolk sac via ultrasound ...