title: Prevalence of neurofibromatosis 1 in German children at elementary school enrollment.
abstract: OBJECTIVE
  To determine the prevalence of neurofibromatosis 1 (NF1) among 6-year-old children in Germany.
  
  
  METHODS
  A total of 152819 children aged 6 years in 6 German states were screened for NF1 during routine medical examinations at elementary school enrollment in cooperation with local health departments in 2000 and 2001.
  
  
  METHODS
  The prevalence of NF1 among 6-year-old German children was estimated to be 1:2996 (95% confidence interval, 1:2260 to 1:3984).
  
  
  RESULTS
  Fifty-one NF1 cases were identified and confirmed by evaluation by appropriate medical specialists. Seven other children were found to have multiple cafe au lait spots without other apparent features of NF1. A minimum estimate of the crude prevalence was 3.0 per 10 000 (95% confidence interval, 2.3-4.0 per 10 000 population). The incidence of NF1 in this population was probably in the range of 30 to 38 cases per 100 000 live births.
  
  
  CONCLUSIONS
  Our study obtained a nearly unbiased birth incidence of NF1 of approximately 1 in 2600 to 1 in 3000 and demonstrates that NF1 can be diagnosed by age 6 years in most cases by routine physical examination with special attention to the disease-associated skin stigmata.
authors.affiliation: Department of Maxillofacial Surgery, University Hospital Eppendorf, Hamburg, Germany.
authors.forename: Marga
authors.initials: M
authors.lastname: Lammert
authors.forename: Jan M
authors.initials: JM
authors.lastname: Friedman
authors.forename: Lan
authors.initials: L
authors.lastname: Kluwe
authors.forename: Victor F
authors.initials: VF
authors.lastname: Mautner
mesh_terms: D019080:Cafe-au-Lait Spots / Q000453:epidemiology; D002648:Child; D005858:Germany / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D009456:Neurofibromatosis 1 / Q000453:epidemiology*; D015995:Prevalence; D012574:Schools / Q000706:statistics & numerical data*