(Stroke. 2000;31:1588.)
© 2000 American Heart Association, Inc.
Original Contributions |
From the National Public Health Institute (C.S., Z.C., J.T.), Helsinki, Finland, and the Institute of Cardiology (D.R.), Kaunas, Lithuania.
Correspondence to Dr Cinzia Sarti, Department of Epidemiology and Health Promotion, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland. E-mail cinzia.sarti{at}ktl.fi
| Abstract |
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MethodsWe included all deaths from cerebrovascular disease for the population aged 35 to 84 years from all the countries in which death certificates were estimated to be available for at least 80% for the period from 1968 to 1994. Age-standardized mortality rates from stroke were calculated for each country for the last available 5 years. Time trends were calculated by using ordinary linear regression and are presented for the entire study period and for 3 separate time periods: 1968 to 1974, 1975 to 1984, and 1985 to 1994. The last 10-year period was further subdivided into 2 parts of 5 years each. We analyzed data separately for men and women and for groups aged 35 to 74 years and 75 to 84 years.
ResultsThe highest rates at the end of the study period for the population aged 35 to 74 years were observed in eastern Europe and previous Soviet Union countries (309 to 156/100 000 per year among men and 222 to 101/100 000 per year among women), Mauritius (268/100 000 per year among men and 138/100 000 per year among women), and Trinidad and Tobago (185/100 000 per year among men and 134/100 000 per year among women). Relatively low to average rates (<100/100 000 per year among men and <70/100 000 per year among women) were reported for Western Europe, with an exception of Portugal (162/100 000 per year among men and 95/100 000 per year among women). The countries with lowest stroke mortality rates at the end of the study period, such as the United States, Canada, Switzerland, France, and Australia, experienced steep declining trends. However, the slope of the decline was substantially reduced during the last 5 years in these countries. Mortality from stroke increased most in the eastern European countries, especially during the last 5 years. Among other high-risk populations, no change in stroke mortality trends was observed in Mauritius, whereas somewhat declining trends were seen in Trinidad and Tobago.
ConclusionsWe observed large differences in mortality rates from stroke around the world together with a wide variation in mortality trends. A widening gap was observed between 2 groups of nations, those with low and declining stroke mortality rates and those with high and increasing mortality, in particular, between western and eastern Europe. Eastern European countries should initiate actions aiming at the reduction of stroke risk, perhaps by looking at the examples of Japan and Finland and the other countries that have been the most successful in reducing previously very high mortality from stroke.
Key Words: cerebrovascular disorders mortality stroke
| Introduction |
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During recent years, it has been suggested that the continuing decline
in stroke mortality has slowed down in several industrialized
countries.9 However, it is not clear whether this
observation is temporary or whether it is common for most countries
that experienced a decline in stroke mortality in the recent past.
Another reason for having a fresh look at international trends is that
the world map has changed extensively during the last decade, with a
number of new nations emerging into the international arena, and
political turmoil might be reflected in the disease statistics. There
is a lack of data regarding stroke trends in these countries. In
addition, except for an article by La Vecchia et al,10
previous articles on international stroke trends dealt only with
middle-aged populations (aged 40 to 69 years)1 or with
populations aged
74 years2 and covered changes in
mortality up to 198910 or earlier. There is a lack of
knowledge on stroke mortality trends in the elderly. Also, most
previous articles included a limited number of countries. The
present study, analyzing mortality trends in elderly people, in
many countries, and during the last 3 decades, investigates the natural
history of stroke mortality around the world.
The aim of the present article is to update and analyze in more detail the available information on international trends in stroke mortality. We present stroke mortality rates for the last available 5 years and trends in stroke mortality during the last 3 decades in men and women aged 35 to 84 years in 51 industrialized and developing countries from different parts of the world.
| Subjects and Methods |
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Rates have been standardized by using the Segis world population for direct standardization (Waterhouse et al11 ). The trends in rates were calculated from age-standardized annual rates by use of the regression model log rt=a+bt+et, assuming that the annual numbers of deaths within age groups follow Poisson distribution and allowing for additional deviation from the regression line. The instantaneous change rate per year at the time point t is a constant proportion, 100b percentage of the event rate at t; 100b is presented in the tables as the early percentage change. In sum, the annual change in mortality is assumed to be constant and log-linear. The yearly percentage changes in stroke mortality were calculated for the entire study period, from 1968 to 1994, with this period divided into 3 parts: 1968 to 1974, 1975 to 1984, and 1985 to 1994. The mortality trend for a country was calculated if data were available for at least 5 years during a given time period. Time trends for the entire study period were calculated only for the countries that were eligible for the trend analyses during all 3 time periods.
| Results |
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The annual percentage change in mortality from stroke in men and women
aged 35 to 74 and 75 to 84 years during the 3 consecutive time periods
is presented in Tables 3 through 6![]()
![]()
![]()
and during the entire period of 1968 to 1994 in Figures 1
and 2
.
Throughout the entire study period, the largest decline was observed in
Japan, Australia, France, Switzerland, and the United States (for men
and women) and in Israel (for women) (Figures 1
and 2
).
In most western European countries, Australia, Japan, the United
States, and Canada, a clear decline in stroke mortality had already
occurred during the 1970s, and it accelerated in the 1980s and still
continued to decline at the beginning of the 1990s (Tables 3 through 6![]()
![]()
![]()
).
Slowing down of the decreasing trend during the last study period,
especially during the last 5 years (Tables 7
and 8
),
was observed in Denmark, Norway, Sweden, the Netherlands, Israel, the
United States, and Canada. In addition, the same pattern could also be
observed in Japan and Australia. In general, the countries with the
lowest stroke mortality rates at the end of the study period had also
experienced a steep decline in mortality during the previous 10 or 20
years. Also, some countries for which still moderate or high stroke
mortality rates were observed during 1990 to 1994 showed a continuing
declining trend (Japan, Finland, Portugal, Greece, and Trinidad and
Tobago).
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Only a few countries in eastern Europe, such as Poland, Bulgaria, former Yugoslavia, and Romania, presented an increasing trend in mortality from stroke among men aged 35 to 74 years during all 3 time periods studied. Among women aged 35 to 74 years, only Poland had a significantly increasing trend during the first study period, from 1968 to 1974, and Mauritius had a significantly increasing trend during the second period, from 1975 to 1984. Similar patterns were observed for the group aged 75 to 84 years, for both men and women, except for Mauritius and Mexico, who joined the group of a few eastern European countries showing an increasing trend in mortality from stroke throughout the entire study period.
In general, among people aged 35 to 74 years, the temporal trends in
stroke mortality were more favorable in women than in men. In the
countries with increasing trends, the increase was smaller in women
than in men in most, but not all, cases. Conversely, in the countries
with declining trends, the decline tended to be steeper in women than
in men (Tables 3 through 6![]()
![]()
![]()
). The trends observed among people
aged 75 to 84 years were in the same direction as in the younger
people, but the relative changes were smaller in the older age group.
This is confirmed by the high correlation in stroke mortality trends
observed between the younger and older age groups in men
(r=0.85, P=0.0001) and in women
(r=0.85, P=0.0001) (Figure 3
). Similarly, high correlations (ie,
trends in the same direction) were also observed between men and women
in both age groups (35 to 74 years, r=0.95,
P=0.0001; 75 to 84 years, r=0.92,
P=0.0001) (Figure 4
).
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For the countries that used to belong to the former Soviet Union, we
had data for only the last 10 years. All of them showed increasing
stroke mortality in both men and women and in both age groups (Tables 3 through 6![]()
![]()
![]()
). Because all these countries experienced enormous
socioeconomic and political changes during the early 1990s with the
fall of Soviet Union, we decided to explore whether there was any
notable effect of these changes on trends in mortality from stroke by
dividing the last 10 years into two 5-year periods: before and after
the collapse of the Soviet Union (Tables 7
and 8
). All of these
former republics of the Soviet Union experienced a marked unfavorable
change in the overall trend in mortality from stroke since 1991. This
further subdivision also showed that the declining trend in stroke
mortality has indeed been slowing down after 1990 in Japan, Australia,
Austria, the Netherlands, Switzerland, Canada, and the United States.
Several other countries, such as Finland, Spain, Portugal, Sweden, and
the United Kingdom, were still showing a steep downward trend in
mortality from stroke in both men and women in all age groups during
the latter period, from 1991 to 1994.
| Discussion |
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80%. The WHO data bank does not provide information on mortality rates from different subtypes of stroke. On the other hand, it is not likely that the adoption of the 9th revision of ICD has influenced the death rates from cerebrovascular disease, because this overall category of stroke deaths is essentially similar in the 8th and 9th revisions of ICD. Furthermore, increasing trends in mortality from stroke in eastern European countries are not isolated. On the contrary, they are strongly associated with an increase in cardiovascular mortality and total mortality reported independently by other authors.5 12 13 In addition, in the present study, a clear correlation was observed between the stroke mortality trends in men and women, which also speaks against the possible inconsistency of the data presented. Therefore, we are confident that the findings related to trends in stroke mortality observed in the countries included in our analyses are real.
Sex Differences
Although we observed trends mainly in the same direction in
men and women, the magnitude of the change differed by sex and age. The
temporal trends in stroke mortality were more favorable in women than
in men, and in the countries with increasing trends, the increase was
smaller in women than in men in most cases. Conversely, in the
countries with declining trends, the decline tended to be steeper in
women than in men. The trends observed among people aged 75 to 84 years
were in the same direction, but the relative changes were smaller in
the older age group. Hormonal differences have been postulated to sex
differences in cerebrovascular disease, but the studies are
conflicting. An increased risk for ischemic stroke has been
suggested for postmenopausal women who use oral estrogen replacement
therapy.14 Clinical studies, on the other hand, have
suggested that estrogen replacement therapy enhances the cognitive
function and protects against brain injuries, such as
stroke.15 However, other studies did not confirm an
increase or a decrease in the risk of ischemic stroke
associated with hormone replacement therapy.16
Western Europe and Other Industrialized Countries
All the countries with low stroke mortality rates or those
that showed steep declines from the previously high stroke mortality
rates during the last 25 years are affluent industrialized countries.
Countries such as Japan and Finland, which had, respectively, the
highest and the second highest rate of stroke mortality in the world in
the beginning of the 1970s, did particularly well.1 2 3 The
magnitude of the decline was also remarkable in some countries (eg,
Australia and the United States) starting from a more favorable
position. Moreover, this declining trend could be also seen among
people aged >74 years, indicating a general improvement in the risk of
stroke and not only a shift of stroke mortality toward the older ages.
The difference between the trends observed in the 2 age groups can be
roughly attributed to a shift of stroke onset to the latter age
group.
A number of studies have been conducted to document and to
explain the accelerated decline in stroke mortality during the late
1970s and the early 1980s in a number of industrialized countries.
Earlier studies also reported the declining trends in both the
incidence and case fatality of stroke during the
1970s.17 18 19 However, more recent studies supported by the
data from the population-based stroke registers have not been able to
show any significant decline in the incidence of
stroke.20 21 22 23 Nevertheless, mortality from stroke has
continued to decline throughout the 1970s and the 1980s in these
countries, suggesting that acute stroke events have become milder and
that the prevalence of stroke survivors in these communities is
increasing. Whether this decline in mortality from stroke can be
attributed to an improvement in the control of hypertension has been
debated.24 25 There is evidence suggesting that a decrease
in the prevalence of some environmental factors, presumably the
decrease in the intake of dietary salt and saturated fat, has
contributed more to the decrease in stroke mortality than has
pharmacological treatment of hypertension alone.24 26 27
It has also been postulated that a reduction in salt intake by
50 mmol/d in the entire population would be 1.5 times more
effective than pharmacological treatment of all hypertensive patients
to reduce stroke mortality in the community.28 Flat or
even increasing trends in the incidence of stroke are in sharp contrast
to the results from a number of the clinical trials involving the
treatment of hypertension, which have consistently documented
significant reductions in the expected numbers of new cases of
stroke.29 30 31 It could be speculated that efforts directed
to the effective control of hypertension have contributed to the
decline in mortality from stroke by reducing the severity of acute
stroke events but also by reducing the incidence of stroke. Only a
study on trends in different subtypes of stroke could tell us whether
this assumption is correct or not, because different subtypes of stroke
have different prognoses. Unfortunately, routine mortality data
collected from so many countries are not reliable enough to allow
subtype-specific analyses. This limits the possibility of an
interpretation of the temporal trends. Another severe limitation is the
lack of information on case fatality, which requires incidence data to
be calculated. Without case-fatality and subtype analyses, we
can only speculate on the reasons for the changes in trends. For
example, in Finland, subarachnoid hemorrhage and
intracerebral hemorrhage represent
20% of all strokes but account for
40% of all stroke
deaths.32 Because hypertension is the most important risk
factor for intracerebral and subarachnoid
hemorrhage, changes in the level of hypertension control my
produce large changes in case fatality from different subtypes of
stroke. In sum, it is very important that studies on routinely
collected data be accompanied by population-based studies collecting
incidence data and accurate data on the subtypes on stroke.
In spite of the generally favorable trends in stroke mortality observed in many industrialized countries, some of these countries seem to have experienced a slowdown of the declining trend during the last 10 and especially during the most recent years. Most of these countries currently have the lowest stroke mortality rates. This may indicate that without intensified application of the available measures for primary and secondary prevention of stroke or without new methods yet to be identified, the maximum results have already been obtained. This slowing down of the decline in stroke mortality may also in some countries mask a relapse in hypertension detection and control. It is also possible that some risk factors for stroke are increasing, which might have led to the slowdown in the mortality decline and a possible upturn in stroke incidence. The data available seem to support this hypothesis, inasmuch as the incidence of diabetes,33 34 abdominal obesity,35 36 and alcohol drinking37 are increasing in most countries. In addition, although the prevalence of hypertension has not increased, the incidence of congestive heart failure seems to be rising,38 and the prevalence of atrial fibrillation, an important risk factor for stroke, might also be increasing.39 40 Both of them are important risk factors for stroke. These trends may be primarily related to the improved long-term survival of patients with hypertension and also those with ischemic heart disease, who are at very high risk of stroke.41
Eastern European Countries: A Special Case for Stroke
There is a clear difference in stroke trends between western and
eastern European countries. Because hypertension is the main
determinant of stroke, this difference suggests that environmental
factors causing high blood pressure have not decreased or have even
increased in eastern European countries. Also, inadequate control of
hypertension on a population level is still widespread in eastern
Europe.42 Differences in trends in risk factors, such as
smoking, alcohol consumption, and diet, probably have the primary role
in explaining the diverging trends in stroke mortality in different
parts of Europe.5 6 The early 1990s were characterized by
economic uncertainty and political instability in eastern Europe.
Psychological disorders, especially depression, are important
determinants of mortality, particularly that due to cardiac
causes.43 44 Depression, increased alcohol consumption,
and an impoverished health care system seem to be associated with the
degrading health of the population. More affluent western European
countries have more comprehensive and better funded health care
systems. However, the allocation of available resources is at least as
important in health promotion as is the increase of resources. Eastern
European countries could find good and relatively inexpensive methods
to limit this problem of high stroke mortality by observing the
examples of the countries that have successfully tackled the problem
(such as Japan and Finland) through large community-based risk factor
control and salt reduction in the diet in the previous
decades.45 46
Other Countries
Although there is a lack of studies directly addressing the
issue of stroke risk in Trinidad and Tobago, there are strong
indications that the high mortality from stroke in this country is due
to the high stroke risk profile of its population, as reported in a
study comparing subjects hospitalized for coronary heart
disease in Trinidad and the United Kingdom.47 A high
prevalence of hypertension and noninsulin-dependent diabetes mellitus
has been found especially among the Asian Indian population, followed
by the population of African descent; the lowest has been found in
European offspring.48 49 Conversely, it is possible that
the relatively lower mortality from stroke in Cuba (compared with
Trinidad and Tobago) could be ascribed to different patterns of risk
factors for stroke in this country, especially
diabetes.50 51 Also, Mauritius reported stroke mortality
rates among the highest, with no declining trend during the most recent
years. Thus far, there are no specific studies on cerebrovascular
disease in this country; however, a large survey of
cardiovascular risk factors has been ongoing for
several years, showing that this population has high levels of risk
factors, especially diabetes.52 It is worth noting that
the populations of Mauritius and of Trinidad and Tobago consist of
Asian Indians and Creoles (with a strong African admixture) and that in
these countries a very high prevalence of diabetes has been
found.49
Different genetic background probably explains part of the differences observed in stroke mortality worldwide. For example, stroke appears to affect black people disproportionately, and many authors agree that the excess risk factor burden does not completely explain the differences in blacks and whites.25 53 54 It has also been observed that intracranial atherosclerosis occurs predominantly in the black population, whereas extracranial disease is relatively more common in whites.55 Intracranial atherosclerosis and hemorrhagic stroke are also more common in oriental populations compared with white populations.55 56 Weather conditions may also influence stroke occurrence, triggering a stroke event or affecting its outcome, and thus explain part of the differences in mortality observed. Several studies have addressed this issue, but the results are not definitive: although a winter excess of ischemic strokes, which is supposedly linked to cold weather, has been reported,57 58 this has not been confirmed in all studies.59 A Chinese study, for example, found that thrombotic stroke deaths were more frequent in hot (>32°C) and in cold (<26°C) weather, whereas the risk of dying from hemorrhagic stroke decreased with increasing temperatures.60
We did not provide stroke mortality rates for China because these
data are not available in the WHO database. However, it is known that
for the past few decades, stroke has been a principal cause of death in
China, as in other eastern Asian countries.7 The burden of
stroke in the entire eastern Asian region is predicted to increase,
both in absolute terms and as a proportion of total disease
burden.7 Although the reasons for the greater burden of
stroke in eastern Asian populations remain unclear, the recent
available data have suggested that the association between blood
pressure and stroke may be stronger there than in western
populations.61 Asian populations are also particularly
prone to diabetes, which is rapidly increasing in all Asian
countries.33 In the study by the Eastern Stroke and
Coronary Heart Disease Collaborative Research
Group,61 a decrease of 5 mm Hg in usual
diastolic blood pressure was associated with a 44%
decrease in the risk of stroke in eastern Asia compared with a 34%
decrease in stroke risk in a similar study of 9 western
populations,62 and it was associated with a 27% lower
stroke risk in another study, mostly of western
populations.63 The observed association of blood pressure
with stroke was so strong that the decline in average
diastolic blood pressure of
4 mm Hg reported for
Japan over the past few decades could explain most of the decrease of
stroke, particularly hemorrhagic stroke, observed during the study
period.64
Information based on official mortality statistics, such as in
the present study, is very useful. Nevertheless, trends in
mortality from stroke do not necessary reflect stroke occurrence in
many countries. We know that trends in stroke incidence do not always
parallel the trends in mortality from stroke. Although declining trends
have been observed in mortality, trends in incidence can be flat or
even increase.48 Keeping in mind that
70% of stroke
patients survive
1 month after acute stroke,65 official
mortality data might depict a too optimistic picture of the situation.
Thus, to investigate the reasons behind stroke trends, it is essential
that we also maintain data on the incidence of stroke and on case
fatality and that we have reliable data on the subtypes of stroke.
Because these data should be obtained only on a population basis,
well-organized and standardized population-based stroke registers are
of the greatest importance. They require more manpower and funds
compared with the maintenance of the official mortality
statistics, but such efforts are very small compared with the entire
burden of stroke.
Received September 24, 1999; revision received April 20, 2000; accepted April 20, 2000.
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