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Incidence of aneurysmal subarachnoid hemorrhage in Norway, 1999–2007

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Abstract:

Lindekleiv HM, Njølstad I, Ingebrigtsen T, Mathiesen EB. Incidence of aneurysmal subarachnoid hemorrhage in Norway, 1999–2007.

Acta Neurol Scand: 2011: 123: 34–40.

© 2010 The Authors Journal compilation © 2010 Blackwell Munksgaard. Objective – 

To investigate changes and regional variations in annual incidence rates of aneurysmal subarachnoid hemorrhage (SAH) in Norway between 1999 and 2007. Methods – 

The authors retrospectively reviewed data from the Norwegian Patient Register for the period 1999–2007. Results – 

Crude incidence of aneurysmal SAH was 10.0/100,000 person years [95% CI (confidence interval): 9.7–10.3] and was higher in women (12.0/100,000 person years; 95% CI: 11.5–12.5) than men (8.1/100,000 person years; 95% CI: 7.7–8.4). Decreasing annual incidence rates were observed from 11.1/100,000 person years (95% CI: 10.5–11.6) in the period 1999–2001 to 8.9/100,000 person years (95% CI: 8.4–9.4) in the period 2005–2007 (P for trend <0.001). Regional variations were observed, from 8.4/100,000 person years (95% CI: 7.7–9.00) in the southern region, 10.4/100,000 person years (95% CI: 9.5–11.2) in the central region and 11.9/100,000 person years (95% CI: 10.8–12.9) in the northern region. Conclusions – 

Incidence of aneurysmal SAH in Norway decreased from 1999 to 2007, with significant regional variations indicating an increasing gradient from south to north.

Keywords: incidence; intracranial aneurysms; subarachnoid hemorrhage

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1600-0404.2010.01336.x

Affiliations: Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway

Publication date: January 1, 2011

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