title: Reproductive patterns among Danish women with oral clefts.
abstract: OBJECTIVE
  The aim of this study was to compare reproduction patterns among Danish women born with isolated oral clefts versus the Danish background population.
  
  
  METHODS
  A nationwide population-based historic cohort study based on three registers: The Danish Facial Cleft Register, The Danish Civil Registration System, and the Fertility of Women and Couples Dataset.
  
  
  METHODS
  Through linkages of the registers, the number of children and the exact age at childbirth of all Danish women born with an oral cleft from 1950 through 1988 (N = 1931) were obtained. These data were compared with similar data for the entire Danish female background population (N = 1,184,390).
  
  
  CONCLUSIONS
  This study suggests that childlessness is higher among women born with an oral cleft (55%) than among women in the Danish background population (44%). Excluding women without children, women born with oral cleft had an average of 1.98 children per woman. This did not differ significantly from the background population (2.02 children/woman). Furthermore, the present study found that Danish women born with oral clefts on average were older (27.3 years of age) than the background population (24.7 years of age) when they had their first child (difference = 2.6 years, confidence interval = 2.41 to 2.80).
  
  
  CONCLUSIONS
  Danish women born with an oral cleft more often are childless or have their first child later, but if they have children, they tend to have as many children as other Danish women. Social, psychological, and biological reasons might be responsible for the reduced fertility.
authors.forename: Janne Elin
authors.initials: JE
authors.lastname: Yttri
authors.forename: Kaare
authors.initials: K
authors.lastname: Christensen
authors.forename: Lisbeth B
authors.initials: LB
authors.lastname: Knudsen
authors.forename: Camilla
authors.initials: C
authors.lastname: Bille
mesh_terms: D000328:Adult; D002971:Cleft Lip; D002972:Cleft Palate; D003718:Denmark; D005260:Female; D020073:Gravidity; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D012042:Registries