Appraisal of: Dakin H. Review of studies mapping from quality of life or clinical measures to EQ-5D: an online database. Health and Quality of Life Outcomes 2013;11(1):151.

Reviewer(s): 
Short description: 
This paper reported the creation of a database of mapping studies. The mapping studies provided mapping algorithms to convert quality of life instrument values to EQ-5D (EuroQoL) instrument values. Following a search of MEDLINE and three websites, the authors identified ninety mapping studies, which reported eighty mapping algorithms. These were described in the paper. The studies can be searched in a free internet database: http://www.herc.ox.ac.uk/downloads/mappingdatabase. The database also contains references to studies validating mapping algorithms and supplementary information including tools to generate predictions. It is intended that the database will be updated. It is possible to register by email to be informed of updates to the database.
Limitations stated by the author(s): 
The author did not search Embase or the grey literature where mapping may also be reported. Some studies might have been excluded because of lack of information but might have proved to be relevant if the authors had been contacted to provide more information.
Limitations stated by the reviewer(s): 
The author did not report the full search terms and search term combinations used to identify studies from MEDLINE, so it is difficult to know whether the search was fit for purpose.
Study Type: 
Single study
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