on September 8, 2005
Published online before print September 8, 2005, doi: 10.1161/01.STR.0000181079.42690.bf
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Submitted on April 12, 2005
From the Clinical Trials Research Unit (C.A., K.C., M.H., V.F.), School of Population Health, Faculty of Medicine and Health Sciences, University of Auckland, New Zealand; The George Institute for International Health (C.A., K.C., M.H.), University of Sydney and Royal Prince Alfred Hospital, Sydney, Australia; Neuroservices, Auckland City Hospital, and the Department of Medicine (P.A.B.), Faculty of Medicine and Health Sciences, University of Auckland, Auckland, New Zealand; the Department of Epidemiology and Biostatistics, School of Population Health (J.B.B.), Faculty of Medicine and Health Sciences, University of Auckland, Auckland, New Zealand; and the Office of the Assistant Director-General of Health, Evidence for Information and Policy (R.B.), World Health Organization, Geneva, Switzerland. * To whom correspondence should be addressed. E-mail: canderson{at}thegeorgeinstitute.org.
Background and Purpose--Long-term trends in stroke incidence in different populations have not been well characterized, largely as a result of the complexities associated with population-based stroke surveillance. Methods--We assessed temporal trends in stroke incidence using standard diagnostic criteria and community-wide surveillance procedures in the population ( Results--From 1981 to 1982, stroke rates were stable in 1991-1992 and then declined in 2002-2003, to produce overall modest declines in standardized incidence (11%; 95% CI, 1 to 19%) and attack rates (9%; 95% CI, 0 to 16%) between the first and last study periods. Some favorable downward trends in vascular risk factors such as cigarette smoking were counterbalanced by increasing age and body mass index, and frequency of diabetes, in patients with stroke. Conclusions--There has been a modest decline in stroke incidence in Auckland over the last 2 decades, mainly during 1991 to 2003, in association with divergent trends in major risk factors.
Revised on June 13, 2005
Accepted on July 14, 2005
Trends in Stroke Incidence in Auckland, New Zealand, During 1981 to 2003
Craig S. Anderson PhD, FRACP*;
1 million) of Auckland, New Zealand, over 12-month calendar periods in 1981-1982, 1991-1992, and 2002-2003. Age-adjusted first-ever (incident) and total (attack) rates, and temporal trends, were reported with 95% confidence intervals (CIs). Rates were analyzed by sex and major age groups.
Key words: epidemiology • incidence • New Zealand • stroke • trends
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