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Reliability and validity of the Norwegian translation of the Seattle Angina Questionnaire following myocardial infarction

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Abstract

The aim of this study was to validate the Norwegian version of the Seattle Angina Questionnaire (SAQ), a self-administered 19-item questionnaire designed to assess health-related quality of life in patients with chest pain or coronary artery disease. In 885 patients with prior myocardial infarction (MI), we abstracted clinical data from the patients’ medical records. Two to three years after the MI, we mailed a self-administered questionnaire including the SAQ, the Short Form 36 (SF-36), and questions about current medication, to the 548 patients still alive. The response rate was 74%. Internal consistency reliability of the SAQ, assessed with Cronbach’s α, ranged 0.75–0.92. Test–retest reliability, tested with an intraclass correlation coefficient, ranged 0.29–0.84. The pattern of association between similar and dissimilar scales of the SAQ and SF-36 mainly supported the construct validity of the SAQ. Four of the five SAQ scales discriminated between patients with different medication regimens as a proxy for severity of angina pectoris. We conclude that the Norwegian version of the SAQ showed acceptable reliability and cross-sectional validity following MI, with properties in line with the original US version.

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Abbreviations

CAD:

coronary artery disease

HRQoL:

health-related quality of life

ICD-10:

International Statistical Classification of Diseases and Related Health Problems, tenth revision

ICC:

intraclass correlation coefficient

MI:

myocardial infarction

SAQ:

Seattle Angina Questionnaire

SF-36:

Short Form 36

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Authors and Affiliations

  1. Quality Evaluation Department, Norwegian Health Services Research Centre, Norway

    Kjell I. Pettersen & Knut Stavem

  2. Department of Medicine, Akershus University Hospital, Nordbyhagen

    Kjell I. Pettersen & Knut Stavem

  3. The Department of Pharmacotherapeutics, University of Oslo, Oslo, Norway

    Aasmund Reikvam

Authors
  1. Kjell I. Pettersen
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  2. Aasmund Reikvam
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  3. Knut Stavem
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Correspondence to Kjell I. Pettersen.

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Pettersen, K.I., Reikvam, A. & Stavem, K. Reliability and validity of the Norwegian translation of the Seattle Angina Questionnaire following myocardial infarction. Qual Life Res 14, 883–889 (2005). https://doi.org/10.1007/s11136-004-0802-2

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