title: Impact of early admission in labor on method of delivery.
abstract: OBJECTIVE
  The effect of the timing of admission in labor unit on the method of delivery was evaluated in a cohort study.
  
  
  METHODS
  Four hundred and sixty six low-risk nulliparous women who were admitted in the labor unit in latent phase (group 1) were compared with 329 parturient women who were admitted in the active phase (group 2) to determine rate of and reasons for cesarean section, cervical dilation at the time of cesarean, and the rate of labor augmentation.
  
  
  RESULTS
  The number of cesarean deliveries in group 1 was greater than that in the group 2 (301 vs 80, p<0.0001 ). The main reason for cesarean section in group 1 was dystocia, and in 2, fetal distress. The rate of cesarean section in the women who were augmented was greater in group 1 than in group 2 (54% vs 23%, p<0.0001).
  
  
  CONCLUSIONS
  Later admission in labor increases the rate of spontaneous vaginal delivery in low risk nulliparous women.
authors.affiliation: Tarbiat Modarres University and Shahed University, Tehran, Iran.
authors.forename: P
authors.initials: P
authors.lastname: Rahnama
authors.forename: S
authors.initials: S
authors.lastname: Ziaei
authors.forename: S
authors.initials: S
authors.lastname: Faghihzadeh
mesh_terms: D000293:Adolescent; D000328:Adult; D020070:Cervical Ripening / Q000502:physiology*; D002585:Cesarean Section; D016009:Chi-Square Distribution; D015331:Cohort Studies; D036861:Delivery, Obstetric / Q000009:adverse effects / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D005865:Gestational Age; D006779:Hospitals, Public; D006801:Humans; D007745:Labor Onset; D008423:Maternal Age; D010298:Parity; D010343:Patient Admission; D049590:Postpartum Period; D011247:Pregnancy; D011256:Pregnancy Outcome; D011336:Probability; D013997:Time Factors; D014219:Trial of Labor