title: Rates and risk factors for recurrence of gestational diabetes.
abstract: OBJECTIVE
  To determine the recurrence rate of gestational diabetes (GDM) during a subsequent pregnancy among women who had GDM during an index pregnancy and to identify factors associated with the probability of recurrence
  
  
  METHODS
  A retrospective longitudinal study was performed in Nova Scotia, Canada, of women who were diagnosed as having GDM during a pregnancy between the years of 1980 and 1996 and who had at least one subsequent pregnancy during this time period. When only the index and first subsequent pregnancy were analyzed, the cohort included 651 women. The recurrence rate of GDM in the pregnancy after the pregnancy with the initial diagnosis of GDM was determined. Multivariate regression models were constructed to model the recurrence of GDM in a subsequent pregnancy as functions of potential predictors to estimate RRs and CIs.
  
  
  RESULTS
  The rate of recurrence of GDM in the pregnancy subsequent to the index pregnancy was found to the 35.6% (95% CI = 31.9-39.3%). Multivariate regression models showed that infant birth weight in the index pregnancy and maternal prepregnancy weight before the subsequent pregnancy were predictive of recurrent GDM.
  
  
  CONCLUSIONS
  In this large cohort of women, slightly more than one-third of the subjects had diabetes in a subsequent pregnancy, which is consistent with recurrence rates in other predominately white populations. Strategies to reduce the occurrence of neonatal macrosomia and maternal prepregnancy obesity may help lower the rate of recurrence of GDM.
authors.affiliation: Department of Mathematics and Statistics, Dalhousie University, Halifax, Nova Scotia, Canada.
authors.forename: S
authors.initials: S
authors.lastname: MacNeill
authors.forename: L
authors.initials: L
authors.lastname: Dodds
authors.forename: D C
authors.initials: DC
authors.lastname: Hamilton
authors.forename: B A
authors.initials: BA
authors.lastname: Armson
authors.forename: M
authors.initials: M
authors.lastname: VandenHof
mesh_terms: D000704:Analysis of Variance; D001724:Birth Weight; D001835:Body Weight; D001942:Breast Feeding; D015331:Cohort Studies; D036861:Delivery, Obstetric; D003920:Diabetes Mellitus / Q000453:epidemiology; D016640:Diabetes, Gestational / Q000453:epidemiology* / Q000503:physiopathology*; D005260:Female; D005951:Glucose Tolerance Test; D006801:Humans; D007231:Infant, Newborn; D008137:Longitudinal Studies; D015999:Multivariate Analysis; D009674:Nova Scotia / Q000453:epidemiology; D011247:Pregnancy; D012008:Recurrence; D012044:Regression Analysis; D012189:Retrospective Studies; D012307:Risk Factors; D012907:Smoking