Open Access Study protocol

Impact of effectiveness information format on patient choice of therapy and satisfaction with decisions about chronic disease medication: the "Influence of intervention Methodologies on Patient Choice of Therapy (IMPACT)" cluster-randomised trial in general practice

Charlotte Gry Harmsen1*, Dorte Ejg Jarbøl1, Jørgen Nexøe1, Henrik Støvring2, Dorte Gyrd-Hansen3, Jesper Bo Nielsen3, Adrian Edwards4 and Ivar Sønbø Kristiansen15

Author Affiliations

1 Research Unit of General Practice, University of Southern Denmark, Southern Denmark, Denmark

2 Department of Public Health, Biostatistics, Aarhus University, Aarhus, Denmark

3 Institute of Public Health, University of Southern Denmark, Southern Denmark, Denmark

4 Cochrane Institute of Primary Care & Public Health, School of Medicine, Cardiff University, Wales, UK

5 Department of Health Management and Health Economics, University of Oslo, Oslo, Norway

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BMC Health Services Research 2013, 13:76  doi:10.1186/1472-6963-13-76

Published: 25 February 2013

Additional files

Additional file 1:

Specially designed algorithms for risk and effectiveness assessment used in the IMPACT trial. The algorithms are based on the same stratifications as the SCORE model and present the estimated ten-year mortality risk and the remaining life expectancy, respectively, without statin treatment as well as the estimated ARR in percentages and POL in months, respectively, if treated with a statin. Participating GPs were allocated and instructed to use only one of the respective effectiveness formats when informing their patients about CVD risk and the effectiveness of statin therapy.

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