Abbreviations
VTE: Venous thromboembolism; DVT: Deep venous thrombosis; PE: Pulmonary embolus; GWG: Gestational weight gain; BMI: body mass index; SD: Standard deviations; ART: Assisted reproductive technology; IUI: Intrauterine insemination; IVF: in-vitro fertilization; ICSI: Intracytoplasmic sperm injection; GDM: Gestational diabetes mellitus; PIH: Pregnancy induced hypertension; aORs: Adjusted odds ratios; Cis: Confidence intervals; IUGR: Intrauterine growth retardation; SGA: Small for gestational age; LGA: Large for gestational age; IQR: Interquartile range; SAS: Statistical Analysis System; LMWH: Low-molecular-weight heparin.