نبذة مختصرة : The aim: To carry out a comparative statistical analysis of obstetric and perinatal complications in singleton and multiple pregnancies once assisted reproductive technologies (ART) are applied according to the records taken from archival materials (maternity and delivery records) and identify the clinical features of multiple pregnancy. Materials and methods: Over the period of 2017-2019, 522 women gave birth in LELEKA Maternity Hospital LLC after using assisted reproductive technologies and 331 women among them were followed-up in the women’s health center of LELEKA maternity hospital. Among these women (522) with singleton pregnancy 445 women gave birth, while in multiple pregnancy – 77. The statistical analysis of 150 maternity and delivery records was carried out. All pregnant women were divided into two groups: group 1 – 75 women having singleton pregnancy after ART; group 2 – 75 women having multiple pregnancy after ART. Women getting pregnant after ART, or in vitro fertilization (IVF) and five-day frozen embryo transfer to be exact, turned out to be the selection criterion for a comparative statistical analysis. Mathematical methods for research were used as O.P. Mintser (2013) suggested. The reliability of the digit cancellation test was calculated using the Fisher’s exact test and Student’s T-test. Graphs were designed using Microsoft Excel. Results: The complications of early multiple pregnancy were the following: anemia (47.8% as opposed to 22.9%, p
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