1. To describe the average labor curve and establish new labor progression standards. 2. Cesarean section rates: Based on big data, the investigator will introduce the international advanced Robson class method and identify the appropriate level of cesarean section rate for each type population. 3. Establishment of "Chinese maternal-fetal medical collaboration network" and APP to promote natural childbirth.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
times of uterus contraction
Timeframe: 10 minutes