doi: 10.1161/01.STR.0000033131.27936.7F
(Stroke. 2002;33:2367.)
© 2002 American Heart Association, Inc.
Original Contributions |
Do Trends in Population Levels of Blood Pressure and Other Cardiovascular Risk Factors Explain Trends in Stroke Event Rates?
Comparisons of 15 Populations in 9 Countries Within the WHO MONICA Stroke Project
From the Department of Epidemiology and Health Promotion, National Public Health Institute, Helsinki, Finland (H.T., M.M., K.K., J.T.); Department of Medicine, University Hospital, Umeå, Sweden (K.A.); Institute of Cardiology of the Kaunas University of Medicine, Kaunas, Lithuania (D.R.); and Centro Malattie Cardiovascolari, Medio Friuli, Osp. S M. Misericordia, Udine, Italy (D.V.P.).
Correspondence to Hanna Tolonen, MSc, Department of Epidemiology and Health Promotion, National Public Health Institute (KTL), Mannerheimintie 166, FIN-00300 Helsinki, Finland. E-mail hanna.tolonen{at}ktl.fi
Background and Purpose— Previous studies have indicated a reasonably strong relationship between secular trends in classic cardiovascular risk factors and stroke incidence within single populations. To what extent variations in stroke trends between populations can be attributed to differences in classic cardiovascular risk factor trends is unknown.
Methods— In the World Health Organization Monitoring of Trends and Determinants in Cardiovascular Disease (WHO MONICA) Project, repeated population surveys of cardiovascular risk factors and continuous monitoring of stroke events have been conducted in 35- to 64-year-old people over a 7- to 13-year period in 15 populations in 9 countries. Stroke trends were compared with trends in individual risk factors and their combinations. A 3- to 4-year time lag between changes in risk factors and change in stroke rates was considered.
Results— Population-level trends in systolic blood pressure showed a strong association with stroke event trends in women, but there was no association in men. In women, 38% of the variation in stroke event trends was explained by changes in systolic blood pressure when the 3- to 4-year time lag was taken into account. Combining trends in systolic blood pressure, daily cigarette smoking, serum cholesterol, and body mass index into a risk score explained only a small fraction of the variation in stroke event trends.
Conclusions— In this study, it appears that variations in stroke trends between populations can be explained only in part by changes in classic cardiovascular risk factors. The associations between risk factor trends and stroke trends are stronger for women than for men.
Key Words: blood pressure • epidemiology • incidence • mortality • risk factors • stroke
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