Abstract: Objective To investigate the high-risk factors and adverse pregnancy outcomes of registered pregnant women in Xi‘an City, and analyze the related factors affecting the adverse pregnancy outcomes. Methods The pregnant women who were registered in the obstetrics department of a hospital in Xi'an City from January 2020 to January 2022 were selected. The risk assessment of high-risk pregnancy was carried out according to the high-risk pregnancy situation, and the pregnancy outcome was tracked to analyze the basic situation and the influence of high-risk factors on the adverse pregnancy outcomes. Results A total of 6 332 registered pregnant women were included in the study, including 1 508 high-risk pregnancies, accounting for 29.97%. The high-risk factors were abnormal pregnancy history （43.63%）, gestational hypertension （33.69%）, age ≥35 years old （26.86%）, gestational diabetes （19.83%）, cicatricial uterus （13.59%）, prenatal hemorrhage （12.86%）, and placenta previa （8.55%）. Adverse pregnancy outcomes occurred in 452 of 6 332 pregnant women, accounting for 7.14%. Multivariate Logistic regression analysis showed that age ≥35 years old （OR=1.581）, pre-pregnancy body mass index ≥28.0 kg/m² （OR=1.432）, abnormal pregnancy history （OR=2.121）, prenatal hemorrhage （OR=1.464）, placenta previa （OR=1.766）, number of high-risk pregnancy factors （OR=2.667）, and pregnancy risk grade （OR=3.367） were independent influencing factors for adverse pregnancy outcomes among registered pregnant women. Conclusions The factors related to high-risk pregnancy are the main risk factors affecting the adverse pregnancy outcome of registered pregnant women. Health management for high-risk pregnant women should be emphasized and appropriate intervention measures should be taken in time to improve the pregnancy outcome.

Key words: High-risk pregnancy, Pregnant woman, Adverse pregnancy outcome, Influencing factor