title: In vitro fertilization in Sweden: child morbidity including cancer risk.
abstract: OBJECTIVE
  To study long-term morbidity among children conceived by IVF.
  
  
  METHODS
  A register study in Sweden of IVF infants compared with all infants born.
  
  
  METHODS
  National health registers.
  
  
  METHODS
  More than 16,000 children born after IVF (30% of them after intracytoplasmic sperm injection) were studied with national health registers.
  
  
  METHODS
  Total number of days in hospital care at different ages, hospitalization for specific diagnoses, childhood cancer.
  
  
  RESULTS
  An overuse of hospital care was found among IVF children up to 6 years of age, which was partly explained by maternal characteristics. Discharge diagnoses indicating brain damage (mental retardation, cerebral palsy, epilepsy, behavioral problems) occurred in excess and seemed to be completely explained by preterm births. In addition, other discharge diagnoses were overrepresented, some of them linked to preterm birth. There were 29 children with cancer (21 expected); 5 of them had Langerhan's histiocytosis.
  
  
  CONCLUSIONS
  Long-term morbidity among children conceived by IVF is higher than among naturally conceived infants. This was partly explained by an excess of preterm and multiple births but might also mirror different parental attitudes toward medical care for their children. No general increase in cancer risk was seen, but unexpectedly many children with histiocytosis were noted.
authors.affiliation: Tornblad Institute, University of Lund, Lund, Sweden. embryol@embryol.lu.se
authors.forename: Bengt
authors.initials: B
authors.lastname: Källén
authors.forename: Orvar
authors.initials: O
authors.lastname: Finnström
authors.forename: Karl-Gösta
authors.initials: KG
authors.lastname: Nygren
authors.forename: Petra Otterblad
authors.initials: PO
authors.lastname: Olausson
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D016001:Confidence Intervals; D005260:Female; D005307:Fertilization in Vitro / Q000523:psychology / Q000706:statistics & numerical data*; D005500:Follow-Up Studies; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009369:Neoplasms / Q000453:epidemiology*; D016017:Odds Ratio; D011247:Pregnancy; D012042:Registries / Q000706:statistics & numerical data; D013548:Sweden