title: Validity of self-reported myocardial infarction and stroke in regions with Sami and Norwegian populations: the SAMINOR 1 Survey and the CVDNOR project.
abstract: Updated knowledge on the validity of self-reported myocardial infarction (SMI) and self-reported stroke (SRS) is needed in Norway. Our objective was to compare questionnaire data and hospital discharge data from regions with Sami and Norwegian populations to assess the validity of these outcomes by ethnicity, sex, age and education.
  
  
  
  Validation study using cross-sectional questionnaire data and hospital discharge data from all Norwegian somatic hospitals.
  
  
  
  should read ‘16 865 men and women aged 30 and 36–79 years participated in the first survey of the Population-based Study on Health and Living Conditions in Sami and NorwegianPopulations (the SAMINOR 1 Survey) in 2003–2004. Information on SMI and SRS was available from self-administered questionnaires for 15 005 and 15 088 of these participants, respectively. We compared this information with hospital discharge data from 1994 until SAMINOR 1 Survey attendance.
  
  
  
  Sensitivity, specificity, positive predictive value (PPV), negative predictive value and κ.
  
  
  
  The sensitivity and PPV of SMI were 90.1% and 78.9%, respectively; the PPV increased to 93.1% when all ischaemic heart disease (IHD) diagnoses were included. The SMI prevalence estimate was 2.3% and hospital-based 2.0%. The sensitivity and PPV of SRS were 81.1% and 64.3%, respectively. The SRS prevalence estimate was 1.5% and hospitalisation-based 1.2%. Moderate to no variation was observed in validity according to ethnicity, sex, age and education.
  
  
  
  The sensitivity and PPV of SMI were high and moderate, respectively; for SRS, both of these measures were moderate. Our results show that SMI from the SAMINOR 1 Survey may be used in aetiological/analytical studies in this population due to a high IHD-specific PPV. The SAMINOR 1 questionnaire may also be used to estimate the prevalence of acute myocardial infarction and acute stroke.
authors.affiliation: Faculty of Health Sciences, Department of Community Medicine, Centre for Sami Health Research, UiT The Arctic University of Norway, Tromsø, Norway.
authors.forename: Bent-Martin
authors.initials: BM
authors.lastname: Eliassen
authors.affiliation: Faculty of Health Sciences, Department of Community Medicine, Centre for Sami Health Research, UiT The Arctic University of Norway, Tromsø, Norway.
authors.forename: Marita
authors.initials: M
authors.lastname: Melhus
authors.affiliation: Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.|Norwegian Institute of Public Health, Bergen, Norway.
authors.forename: Grethe S
authors.initials: GS
authors.lastname: Tell
authors.affiliation: Faculty of Health Sciences, Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway.
authors.forename: Kristin Benjaminsen
authors.initials: KB
authors.lastname: Borch
authors.affiliation: Faculty of Health Sciences, Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway.
authors.forename: Tonje
authors.initials: T
authors.lastname: Braaten
authors.affiliation: Faculty of Health Sciences, Department of Community Medicine, Centre for Sami Health Research, UiT The Arctic University of Norway, Tromsø, Norway.|Department of Medicine, University Hospital of Northern Norway, Harstad, Norway.
authors.forename: Ann Ragnhild
authors.initials: AR
authors.lastname: Broderstad
authors.affiliation: Faculty of Health Sciences, Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway.|Norwegian Institute of Public Health, Oslo, Norway.
authors.forename: Sidsel
authors.initials: S
authors.lastname: Graff-Iversen
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000401:mortality*; D009664:Norway / Q000453:epidemiology; D015995:Prevalence; D018570:Risk Assessment; D012424:Rural Population; D057566:Self Report; D017678:Sex Distribution; D012924:Social Conditions; D020521:Stroke / Q000401:mortality*