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dc.contributor.authorSheikh, Mashhood Ahmed
dc.contributor.authorLund, Eiliv
dc.contributor.authorBraaten, Tonje
dc.date.accessioned2016-03-09T11:46:44Z
dc.date.available2016-03-09T11:46:44Z
dc.date.issued2016-01-21
dc.description.abstractObjective: Self-reported information from questionnaires is frequently used in epidemiological studies, but few of these studies provide information on the reproducibility of individual items contained in the questionnaire. We studied the test– retest reliability of self-reported diabetes among 33,919 participants in Norwegian Women and Cancer Study. Methods: The test–retest reliability of self-reported type 1 and type 2 diabetes diagnoses was evaluated between three selfadministered questionnaires (completed in 1991, 1998, and 2005 by Norwegian Women and Cancer participants) by kappa agreement. The time interval between the test–retest studies was ~7 and ~14 years. Sensitivity of the kappa agreement for type 1 and type 2 diabetes diagnoses was assessed. Subgroup analysis was performed to assess whether test–retest reliability varies with age, body mass index, physical activity, education, and smoking status. Results: The kappa agreement for both types of self-reported diabetes diagnoses combined was good (⩾0.65) for all three test–retest studies (1991–1998, 1991–2005, and 1998–2005). The kappa agreement for type 1 diabetes was good (⩾0.73) in the 1991–2005 and the 1998–2005 test–retest studies, and very good (0.83) in the 1991–1998 test–retest study. The kappa agreement for type 2 diabetes was moderate (0.57) in the 1991–2005 test–retest study and good (⩾0.66) in the 1991–1998 and 1998–2005 test–retest studies. The overall kappa agreement in the 1991–1998 test–retest study was stronger than in the 1991–2005 test–retest study and the 1998–2005 test–retest study. There was no clear pattern of inconsistency in the kappa agreements within different strata of age, BMI, physical activity, and smoking. The kappa agreement was strongest among the respondents with 17 or more years of education, while generally it was weaker among the least educated group. Conclusion: The test–retest reliability of the diabetes was acceptable and there was no clear pattern of inconsistency in the kappa agreement stratified by age, body mass index, physical activity, and smoking. The study suggests that self-reported diabetes diagnosis from middle-aged women enrolled in the Norwegian Women and Cancer Study is reliable.en_US
dc.descriptionPublished version. Source at <a href=http://doi.org/10.1177/2050312115622857>http://doi.org/10.1177/2050312115622857</a>.en_US
dc.identifier.citationSAGE Open Medicine 2016, 4:1-11en_US
dc.identifier.cristinIDFRIDAID 1319975
dc.identifier.doi10.1177/2050312115622857
dc.identifier.issn2050-3121
dc.identifier.urihttps://hdl.handle.net/10037/8804
dc.identifier.urnURN:NBN:no-uit_munin_8354
dc.language.isoengen_US
dc.publisherSAGE publicationsen_US
dc.rights.accessRightsopenAccess
dc.subjectVDP::Medisinske Fag: 700::Klinisk medisinske fag: 750::Onkologi: 762en_US
dc.titleTest–retest reliability of self-reported diabetes diagnosis in the Norwegian Women and Cancer Study: A population-based longitudinal study (n = 33,919)en_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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