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An international measure of awareness and beliefs about cancer: development and testing of the ABC
  1. Alice E Simon1,
  2. Lindsay J L Forbes2,
  3. David Boniface1,
  4. Fiona Warburton2,
  5. Kate E Brain3,
  6. Anita Dessaix4,
  7. Michael Donnelly5,
  8. Kerry Haynes6,
  9. Line Hvidberg7,
  10. Magdalena Lagerlund8,
  11. Lisa Petermann9,
  12. Carol Tishelman8,
  13. Peter Vedsted7,
  14. Maria Nyre Vigmostad10,
  15. Jane Wardle1,
  16. Amanda J Ramirez†2,
  17. the ICBP Module 2 Working Group, ICBP Programme Board and Academic Reference Group
  1. 1Department of Epidemiology and Public Health, Cancer Research UK Health Behaviour Research Centre, University College London, London, UK
  2. 2King's College London Promoting Early Presentation Group, King's College, London, UK
  3. 3Cochrane Institute of Primary Care and Public Health, School of Medicine, Cardiff University, Cardiff, UK
  4. 4Department of Cancer Prevention, Cancer Institute New South Wales, Sydney, New South Wales, Australia
  5. 5Centre for Public Health, Queen's University Belfast, Belfast, Northern Ireland
  6. 6Centre for Behavioural Research in Cancer, Cancer Council Victoria, Victoria, Australia
  7. 7Danish Research Centre for Cancer Diagnosis in Primary Care, Aarhus University, Aarhus, Denmark
  8. 8Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, Stockholm, Sweden
  9. 9Canadian Partnership against Cancer, Toronto, Canada
  10. 10Department of Cancer Research and Molecular Medicine, Norwegian University of Science & Technology, Trondheim, Norway
  1. Correspondence to Dr Alice E Simon; Alice.Simon.1{at}city.ac.uk

Abstract

Objectives To develop an internationally validated measure of cancer awareness and beliefs; the awareness and beliefs about cancer (ABC) measure.

Design and setting Items modified from existing measures were assessed by a working group in six countries (Australia, Canada, Denmark, Norway, Sweden and the UK). Validation studies were completed in the UK, and cross-sectional surveys of the general population were carried out in the six participating countries.

Participants Testing in UK English included cognitive interviewing for face validity (N=10), calculation of content validity indexes (six assessors), and assessment of test–retest reliability (N=97). Conceptual and cultural equivalence of modified (Canadian and Australian) and translated (Danish, Norwegian, Swedish and Canadian French) ABC versions were tested quantitatively for equivalence of meaning (≥4 assessors per country) and in bilingual cognitive interviews (three interviews per translation). Response patterns were assessed in surveys of adults aged 50+ years (N≥2000) in each country.

Main outcomes Psychometric properties were evaluated through tests of validity and reliability, conceptual and cultural equivalence and systematic item analysis. Test–retest reliability used weighted-κ and intraclass correlations. Construction and validation of aggregate scores was by factor analysis for (1) beliefs about cancer outcomes, (2) beliefs about barriers to symptomatic presentation, and item summation for (3) awareness of cancer symptoms and (4) awareness of cancer risk factors.

Results The English ABC had acceptable test–retest reliability and content validity. International assessments of equivalence identified a small number of items where wording needed adjustment. Survey response patterns showed that items performed well in terms of difficulty and discrimination across countries except for awareness of cancer outcomes in Australia. Aggregate scores had consistent factor structures across countries.

Conclusions The ABC is a reliable and valid international measure of cancer awareness and beliefs. The methods used to validate and harmonise the ABC may serve as a methodological guide in international survey research.

  • early detection of cancer
  • cancer early diagnosis
  • validation studies
  • cross-cultural comparison
  • reliability and validity

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