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Aim : To develop a cervical dilatation curve for spontaneous vaginal delivery in Japanese primiparas. Material and methods : This is an observational study. Data were retrospectively collected from delivery records. The subject sample included 483 Japanese primiparas who delivered by spontaneous vaginal delivery at the study institution between January 2012 and June 2015. For statistical analysis, a cervical dilatation curve was created using a smoothing spline function, which was compared withdoi:10.15017/1911189 fatcat:t2nce6hdbrazbmhqrlwjyj3mjq