The frequency and duration of uterine contractions during labour.
D000328:Adult; D000367:Age Factors; D044383:Black People; D005260:Female; D006801:Humans; D007194:India; D007743:Labor, Obstetric; D009119:Muscle Contraction; D010298:Parity; D011247:Pregnancy; D013019:South Africa; D013997:Time Factors; D014599:Uterus / Q000502:physiology*; D044465:White People