title: Proportion of different subtypes of stroke in China.
abstract: OBJECTIVE
  The goal of this article is to clarify the proportion of stroke subtypes in China, where stoke is the most common cause of death.
  
  
  METHODS
  A total of 16,031 first-ever strokes in subjects >or=25 years of age were identified in 1991 to 2000 from 17 Chinese populations through a community-based cardiovascular disease surveillance program in the China Multicenter Collaborative Study of Cardiovascular Epidemiology. World Health Organization diagnosis criteria were used for classification of stroke subtypes.
  
  
  RESULTS
  CT scan rate of stroke cases reached a satisfactorily high level only after 1996 in the study populations. In 8268 first-ever stroke events from 10 populations with CT scan rate >75% in 1996 to 2000, 1.8% were subarachnoid hemorrhage, 27.5% were intracerebral hemorrhage, 62.4% were cerebral infarction, and 8.3% were undetermined stroke. The proportion of intracerebral hemorrhage varied from 17.1% to 39.4% and that for cerebral infarction varied from 45.5% to 75.9% from population to population. The ratio of ischemic to hemorrhagic stroke ranged from 1.1 to 3.9 and averaged 2.0). The 28-day fatality rate was 33.3% for subarachnoid hemorrhage, 49.4% for intracerebral hemorrhage, 16.9% for cerebral infarction, and 64.6% for undetermined stroke.
  
  
  CONCLUSIONS
  In our study, ischemic stroke was more frequent and its proportion was higher than hemorrhagic stroke in Chinese populations. Although hemorrhagic stroke was more frequent in Chinese than in Western populations, the variation in the proportion of stroke subtypes among Chinese populations could be as large as or larger than that between Chinese and Western populations.
authors.affiliation: Department of Epidemiology, Cardiovascular Institute and Fu Wai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Bei Li Shi Rd 167, Beijing, 100037, People's Republic of China.
authors.forename: Lin-Feng
authors.initials: LF
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Hong
authors.forename: Guang-Gu
authors.initials: GG
authors.lastname: Yuan
authors.forename: Bei-Fan
authors.initials: BF
authors.lastname: Zhou
authors.forename: Lian-Cheng
authors.initials: LC
authors.lastname: Zhao
authors.forename: Yi-Ning
authors.initials: YN
authors.lastname: Huang
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
authors.forename: Yang-Feng
authors.initials: YF
authors.lastname: Wu
mesh_terms: D000328:Adult; D017677:Age Distribution; D017668:Age of Onset; D000368:Aged; D002543:Cerebral Hemorrhage / Q000175:diagnosis / Q000453:epidemiology; D002544:Cerebral Infarction / Q000175:diagnosis / Q000453:epidemiology; D002681:China / Q000453:epidemiology; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D009026:Mortality; D011159:Population Surveillance; D012424:Rural Population / Q000706:statistics & numerical data; D017678:Sex Distribution; D020521:Stroke / Q000145:classification* / Q000175:diagnosis / Q000453:epidemiology*; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis / Q000453:epidemiology; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data; D014505:Urban Population / Q000706:statistics & numerical data