(Stroke. 1997;28:2180-2184.)
© 1997 American Heart Association, Inc.
Articles |
Epidemiology of Stroke in Innherred, Norway, 1994 to 1996
Incidence and 30-Day Case-Fatality Rate
From Innherred Hospital, Levanger, and National Institute of Public Health, Community Medicine Research Unit, Verdal, Norway (H.E.); National Institute of Public Health, Community Medicine Research Unit, Verdal, Norway (J.H.); Department of Medicine, University of Trondheim (Norway) (B.I.); and Department of Medicine, University of Uppsala (Sweden) (A.T.).
Correspondence to Hanne Ellekjær, National Institute of Public Health, Community Medicine Research Unit, N-7650 Verdal, Norway. E-mail verdalfh{at}due.unit.no
Background and Purpose In Norway, as well as other industrialized countries, mortality from stroke has declined over the past decades. Data on stroke morbidity are lacking. This study was conducted to determine the incidence, case fatality, and risk factors of stroke in a defined Norwegian population.
Methods During the period 1994 to 1996, a population-based
stroke registry collected uniform information about all cases of
first-ever and recurrent stroke occurring in people aged 
15 years in
the region of Innherred in the central part of Norway (target
population 70 000), where the prevalence of
cardiovascular risk factors was screened in 1984 to
1986 and 1995 to 1997.
Results During the 2 years of registration (September 1, 1994, to August 31, 1996), 432 first-ever (72.8%) and 161 recurrent (27.2%) strokes were registered. The crude annual incidence rate was 3.12/1000 (2.85/1000 for males and 3.38/1000 for females). Adjusted to the European population, the annual incidence rate of first-ever stroke was 2.21/1000. The annual incidence rate of cerebral infarction was 2.32/1000, intracerebral hemorrhage 0.32/1000, subarachnoid hemorrhage 0.19/1000, and unspecified stroke 0.38/1000. The 30-day case-fatality rate was 10.9% for cerebral infarction, 37.8% for intracerebral hemorrhage, and 50.0% for unspecified stroke. Fourteen percent of the patients were found outside the hospital, and only 50% of the suspected stroke cases in the hospital (at admission or reviewed discharge diagnosis of ICD-9 codes 430 to 438) fitted the final inclusion criteria.
Conclusions This first population-based stroke register in Norway revealed incidence rates of stroke similar to other Scandinavian countries, and comparison between other European countries did not indicate regional variations within Western Europe.
Key Words: epidemiology • incidence • Norway • prognosis
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