title: How common are the "common" neurologic disorders?
abstract: OBJECTIVE
  To estimate the current incidence and prevalence in the United States of 12 neurologic disorders.
  
  
  METHODS
  We summarize the strongest evidence available, using data from the United States or from other developed countries when US data were insufficient.
  
  
  RESULTS
  For some disorders, prevalence is a better descriptor of impact; for others, incidence is preferable. Per 1,000 children, estimated prevalence was 5.8 for autism spectrum disorder and 2.4 for cerebral palsy; for Tourette syndrome, the data were insufficient. In the general population, per 1,000, the 1-year prevalence for migraine was 121, 7.1 for epilepsy, and 0.9 for multiple sclerosis. Among the elderly, the prevalence of Alzheimer disease was 67 and that of Parkinson disease was 9.5. For diseases best described by annual incidence per 100,000, the rate for stroke was 183, 101 for major traumatic brain injury, 4.5 for spinal cord injury, and 1.6 for ALS.
  
  
  CONCLUSIONS
  Using the best available data, our survey of a limited number of disorders shows that the burden of neurologic illness affects many millions of people in the United States.
authors.affiliation: National Institutes of Neurological Disorders and Stroke/National Institutes of Health, Bethesda, MD 20892, USA. hirtzd@ninds.nih.gov
authors.forename: D
authors.initials: D
authors.lastname: Hirtz
authors.forename: D J
authors.initials: DJ
authors.lastname: Thurman
authors.forename: K
authors.initials: K
authors.lastname: Gwinn-Hardy
authors.forename: M
authors.initials: M
authors.lastname: Mohamed
authors.forename: A R
authors.initials: AR
authors.lastname: Chaudhuri
authors.forename: R
authors.initials: R
authors.lastname: Zalutsky
mesh_terms: D015982:Bias; D003627:Data Interpretation, Statistical; D019049:Developed Countries / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D009422:Nervous System Diseases / Q000453:epidemiology*; D015995:Prevalence; D016016:Proportional Hazards Models; D015203:Reproducibility of Results; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D018401:Sample Size; D014481:United States / Q000453:epidemiology