title: Risk factors for aneurysmal subarachnoid hemorrhage - BMI and serum lipids: 11-year follow-up of the HUNT and the Tromsø Study in Norway.
abstract: OBJECTIVE
  Life-style factors have been associated with the risk for aneurysmal subarachnoid hemorrhage (aSAH), but it is not clear whether body mass index (BMI) and serum lipids are associated with risk. We prospectively assessed these associations in two large population studies.
  
  
  METHODS
  A total of 65,526 participants in the Nord-Trøndelag Health Study (1995-1997) and 26,882 participants in the Tromsø Study (1994-1995) were included. Studies included measurements of body weight and height, serum lipids, and self-administered questionnaires. Participants who experienced aSAH were identified, and hazard ratios (HRs) were estimated using Cox regression analysis.
  
  
  RESULTS
  During 11 years of follow-up, aSAH was diagnosed in 122 participants. Overweight (BMI 25-29.9) was negatively associated with the risk of aSAH (HR 0.7, 95% CI 0.4-1.0). There was no over all association of total serum cholesterol, HDL cholesterol, or triglycerides with the risk of aSAH, but in participants younger than 50 years, HDL cholesterol was inversely associated with the risk (HR per standard deviation increase 0.6, 95% CI 0.4-0.9).
  
  
  CONCLUSIONS
  Overweight may be associated with reduced risk of aSAH, but there was no over all association of total serum cholesterol, HDL cholesterol, or triglycerides with the risk of aSAH in this prospective study.
authors.affiliation: Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway. marie.s.sandvei@ntnu.no
authors.forename: M S
authors.initials: MS
authors.lastname: Sandvei
authors.forename: H
authors.initials: H
authors.lastname: Lindekleiv
authors.forename: P R
authors.initials: PR
authors.lastname: Romundstad
authors.forename: T B
authors.initials: TB
authors.lastname: Müller
authors.forename: L J
authors.initials: LJ
authors.lastname: Vatten
authors.forename: T
authors.initials: T
authors.lastname: Ingebrigtsen
authors.forename: I
authors.initials: I
authors.lastname: Njølstad
authors.forename: E B
authors.initials: EB
authors.lastname: Mathiesen
authors.forename: A
authors.initials: A
authors.lastname: Vik
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008055:Lipids / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D050177:Overweight; D011446:Prospective Studies; D012307:Risk Factors; D013345:Subarachnoid Hemorrhage / Q000097:blood* / Q000175:diagnosis / Q000453:epidemiology*; D011795:Surveys and Questionnaires
chemical_list: D008055:Lipids