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The readers of IJS may be interested to know that since the 1980s, the epidemiological survey and research carried out in China mainly focused on morbidity and mortality (1, 2), while study of the prevalence rate was not paid enough attention. Furthermore, there is even less study in stroke epidemiology on China's minority elderly population. Within China, extrapolation of current stroke incidence and prevalence studies to the rest of the population is questionable. Most studies are from urban populations and it is known that rates are likely to differ markedly between urban and rural populations even within the same country (3, 4).

In our epidemiological study, stratified multistage random cluster sampling methods were used on Mongolian and Han populations over 55 years old in a rural area of inner Mongolia.

The following results were found:

  • the crude stroke prevalence in the over 55 Mongolian and Han population in the pastoral area of inner Mongolia was 7.36% (standardized prevalence 7.13%)
  • the crude stroke prevalence was 7.06% in the Mongolian population (standardized prevalence 6.94%) and 7.54% in the Han population (standardized prevalence 7.19%)
  • the prevalence of ischemic stroke in the over 55 Mongolian population was 5.18% and the prevalence of hemorrhagic stroke was 1.87%
  • the prevalence of ischemic stroke in over 55 Han people was 5.74% and the prevalence of hemorrhagic stroke was 1.80%, and
  • the prevalence of stroke in over 55 Mongolian and Han populations is at a higher level compared with other countries (5) (Table 1).
Table 1.   Stroke prevalence rates, estimates from the World Health Organization, men and women per 100 000
AgeMongolian (IM of PRC)Han (IM of PRC)Czezh RepublicPortugalSloveniaLatviaItalyGreece
MenWomenMenWomenMenWomenMenWomenMenWomenMenWomenMenWomenMenWomen
  1. *IM, inner Mongolian.

55–6471673258690834 905460426375841302044322524432029941864111433182037
65–7412 3765255984588 04011 959896514 151903897145966832666285095341684976996
75–8412 037872112 94392 80718 71115 17121 02616 18513 444976010 89389949172703814 61614 686
85+526323 529588258 82321 19217 15622 70120 57815 63112 09811 456954810 17812 42519 30821 207

Understanding the stroke epidemiological data of this region is important for understanding the stroke epidemiological status of the Chinese elderly population. It also plays an important role promoting prevention and treatment levels of stroke in this area.

References

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  2. References
  • 1
    Cheng XM, Ziegler DK, Lai YH C et al. Stroke in China, 1986 through 1990. Stroke 1995; 26:19904.
  • 2
    Yang QD, Zou HY, Wang WZ et al. Stroke mortality and distribution characteristics of types of stroke in three areas in China. Chin Geriatr Cardiovasc Cerebrovasc J 2003; 5:3942.
  • 3
    Correia M, Silva MR, Matos I et al. Prospective community-based study of stroke in Northern Portugal. Incidence and case fatality in rural and urban populations. Stroke 2004; 35:204853.
  • 4
    Bermejo F, Vega S, Morales JM et al. Prevalence of stroke in two samples (rural and urban) of old people in Spain. A pilot door-to-door study carried out by health professionals. Neurologia 1997; 12:15761.
  • 5
    Truelsen T, Piechowski-Jóźwiak B, Bonita R. Stroke incidence and prevalence in Europe: a review of available data. Eur J Neurol 2006; 13:58198.