Grivell, R.Reilly, A.Oakey, H.Chan, A.Dodd, J.2012-04-172012-04-172012Acta Obstetricia et Gynecologica Scandinavica, 2012; 91(2):198-2030001-63491600-0412http://hdl.handle.net/2440/70335Objective. To evaluate maternal and neonatal outcomes associated with birth at term by week of gestational age and also by onset of labor. Design. Cohort study. Setting. A state-wide perinatal outcome database. Population. 28 626 women with spontaneous onset of labor, induction of labor for recognized indications and induction of labor for non-recognized indications. Methods. Cohort study utilizing a validated dataset comparing outcomes with type of onset of labor using a log binomial model. Main outcome measures. Cesarean section, assisted vaginal birth, importantmeasures ofmaternal and neonatal morbidity. Results. Induction of labor for non-recognized indications was associated with a significantly increased risk of a range of outcomes, including cesarean section (RR 1.67, 95%CI 1.55–1.80). The lowest risk of adversematernal and infant outcome occurred with birth between 38 and 39 weeks and with the spontaneous onset of labor. Conclusions. Induction of labor for non-recognized indications at term is associated with an increased risk of adverse outcomes. Caution is warranted with a liberal policy of induction of labor at term in an otherwise uncomplicated pregnancy.en© 2011 Nordic Federation of Societies of Obstetrics and GynecologyHumansBirth InjuriesBirth WeightPregnancy OutcomeIntensive Care, NeonatalCesarean SectionExtraction, ObstetricalLabor, InducedModels, StatisticalRiskProspective StudiesGestational AgePregnancyAdultInfant, NewbornFemaleObstetric Labor ComplicationsPerinatal MortalityJournal article002011609510.1111/j.1600-0412.2011.01298.x0002992052000072-s2.0-8485608023126114Grivell, R. [0000-0002-2447-6519]Oakey, H. [0000-0003-1057-7615]Dodd, J. [0000-0002-6363-4874]