title: Predictors of seizure onset in Rett syndrome.
abstract: OBJECTIVE
  To investigate risk factors for seizure onset in Rett syndrome.
  
  
  METHODS
  Information on presence and age at onset of seizures, perinatal and developmental history, and genetic status was abstracted on 275 cases in the Australian Rett Syndrome Database. Cox and Weibull regression were used to investigate and provide a model for predicting the effects of genetic and developmental factors on age at seizure onset.
  
  
  RESULTS
  Seizures were reported in 81% of 275 cases; the median age of onset was 48 months. Not having gained the ability to walk (P = .003) and developmental problems in the first 10 months of age (P = .04) were associated with an almost 2-fold increased risk of seizures. Cases without a detectable MECP2 mutation had a higher risk of seizure onset up to 4 years of age (P < .001) but a lower risk after 4 years (P = .08).
  
  
  CONCLUSIONS
  Seizure onset in Rett syndrome is associated with early developmental factors and with genotype. Information on these factors can be used to predict age at seizure onset after diagnosis.
authors.affiliation: Centre for Child Health Research, The University of Western Australia, Telethon Institute for Child Health Research, Perth, Western Australia, Australia.
authors.forename: Le
authors.initials: L
authors.lastname: Jian
authors.forename: Lakshmi
authors.initials: L
authors.lastname: Nagarajan
authors.forename: Nicholas
authors.initials: N
authors.lastname: de Klerk
authors.forename: David
authors.initials: D
authors.lastname: Ravine
authors.forename: Carol
authors.initials: C
authors.lastname: Bower
authors.forename: Alison
authors.initials: A
authors.lastname: Anderson
authors.forename: Sarah
authors.initials: S
authors.lastname: Williamson
authors.forename: John
authors.initials: J
authors.lastname: Christodoulou
authors.forename: Helen
authors.initials: H
authors.lastname: Leonard
mesh_terms: D000293:Adolescent; D000328:Adult; D001315:Australia; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D009154:Mutation; D015518:Rett Syndrome / Q000150:complications*; D012307:Risk Factors; D012640:Seizures / Q000209:etiology* / Q000235:genetics*