datafinal - 分析.sav

For data collection, we followed the methods of previous study conducted by Tai et al.. All maternal and infant information was obtained from Hospital Information System (HIS) Database. Data were collected from standardized clinical forms and hospital records after maternity discharge to form the research database. All data were extracted and cleaned by using Natural Language Processing technique. Maternal characteristics of all pregnant women were firstly extracted, including maternal age (year), height (cm), intrapartum weight (kg), parity, gestational week, birthplace (Wuxi, Shanghai, or other cities), menstrual cycle (21-35 days, 36 days- or irregularity), history of uterine fibroids, abnormal pregnancy history and assisted reproductive technology (ART) using. Maternal age was divided into five groups: &lt; 25, 25-29, 30-34, 35-39, ≥ 40 years. Intrapartum body mass index (BMI, kg/m²) was calculated as maternal intrapartum weight divided by the square of height, and classified into four groups: &lt; 25, 25-29.9, 30-34.9, ≥ 35 kg/m². Parity did not include this pregnancy and was divided into 0 (primiparae), 1 and ≥ 2. Abnormal pregnancy history refers to a history of spontaneous abortion, fetal malformation, or stillbirth. An ART pregnancy was defined as one conceived following intracytoplasmic sperm injection, <i>in vitro</i> fertilization and embryo transplantation, ovulation induction, gamete intra-fallopian transfer, or artificial insemination.