Open Access Open Badges Letter

The COMET Initiative database: progress and activities from 2011 to 2013

Elizabeth Gargon1*, Paula R Williamson1, Douglas G Altman2, Jane M Blazeby3 and Mike Clarke4

Author Affiliations

1 University of Liverpool, Department of Biostatistics, 1st floor Duncan Building, Daulby Street, Liverpool L69 3GA, UK

2 Centre for Statistics in Medicine, University of Oxford, Oxford OX3 7LD, UK

3 School of Social and Community Medicine, University of Bristol, Canynge Hall, 39 Whatley Road, Bristol BS8 2PS, UK

4 Institute of Clinical Sciences, Block B, Queens University Belfast, Institute of Clinical Sciences, Block B, Royal Victoria Hospital, Grosvenor Road, Belfast BT12 6BA, UK

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Trials 2014, 15:279  doi:10.1186/1745-6215-15-279

Published: 10 July 2014


The Core Outcome Measures in Effectiveness Trials (COMET) Initiative database is an international repository of studies relevant to the development of core outcome sets. By the end of 2013, it included a unique collection of 306 studies. The website is increasingly being used, with more than 12,000 visits in 2013 (a 55% increase over 2012), 8,369 unique visitors (a 53% increase) and 6,844 new visitors (a 48% increase). There has been a rise in visits from outside the United Kingdom, with 2,405 such visits in 2013 (30% of all visits). By December 2013, a total of 4,205 searches had been completed, with 2,139 in 2013 alone.

Core outcome set; Database; Resources