title: Recurrence of small-for-gestational-age pregnancy: analysis of first and subsequent singleton pregnancies in The Netherlands.
abstract: OBJECTIVE
  Small-for-gestational-age (SGA) neonates are at increased risk of adverse pregnancy outcome. Our objective was to study the recurrence rate of SGA in subsequent pregnancies.
  
  
  METHODS
  A prospective national cohort study of all women with a structurally normal first and subsequent singleton pregnancy from 1999-2007. SGA was defined as birthweight <5th percentile for gestation. We compared the incidence and recurrence rate of SGA for women in total and with and without a hypertensive disorder (HTD) in their first pregnancy. Moreover, we assessed the association between gestational age at first delivery and SGA recurrence.
  
  
  RESULTS
  We studied 259,481 pregnant women, of whom 12,943 women (5.0%) had an SGA neonate in their first pregnancy. The risk of SGA in the second pregnancy was higher in women with a previous SGA neonate than for women without a previous SGA neonate (23% vs 3.4%; adjusted odds ratio, 8.1; 95% confidence interval, 7.8-8.5) and present in both women with and without an HTD in pregnancy. In women without an HTD, the increased recurrence risk was independent of the gestational age at delivery in the index pregnancy; whereas in women with an HTD, this recurrence risk was increased only when the woman with the index delivery delivered at >32 weeks' gestation.
  
  
  CONCLUSIONS
  Women with SGA in their first pregnancy have a strongly increased risk of SGA in the subsequent pregnancy and first pregnancy SGA delivers a significant contribution to the total number of second pregnancy SGA cases.
authors: Department of Obstetrics and Gynecology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
authors: Bart Jan
authors: BJ
authors: Voskamp
authors: Brenda M
authors: BM
authors: Kazemier
authors: Anita C J
authors: AC
authors: Ravelli
authors: Jelle
authors: J
authors: Schaaf
authors: Ben Willem J
authors: BW
authors: Mol
authors: Eva
authors: E
authors: Pajkrt
mesh_terms: D000328:Adult; D005260:Female; D005317:Fetal Growth Retardation / Q000453:epidemiology / Q000209:etiology*; D005865:Gestational Age; D006801:Humans; D046110:Hypertension, Pregnancy-Induced; D015994:Incidence; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D009426:Netherlands; D016017:Odds Ratio; D011247:Pregnancy; D011446:Prospective Studies; D012008:Recurrence; D012042:Registries; D012307:Risk Factors