Research related to this thesis is published in the following papers: Ryan A, Greenfield S, Wilson S. Prevalence and determinants of the use of self-tests by members of the public: a mixed methods study. BMC Public Health 2006; 6: 193. http://dx.doi.org/10.1186/1471-2458-6-193 Ryan A, Wilson S, Greenfield S, Clifford S, McManus RJ, Pattison HM. Range of self-tests available to buy in the United Kingdom: an Internet survey. Journal of Public Health 2006, 28(4): 370-374. http://dx.doi.org/10.1093/pubmed/fdl051 Ryan A, Wilson S, Greenfield S. Prevalence of the use of self-tests by adults in the United Kingdom: a questionnaire survey. Journal of Public Health 2010 http://dx.doi.org/10.1093/pubmed/fdq018 Ryan A, Ives J, Wilson S, Greenfield S. Why members of the public self-test: an interview study. Family Practice 2010; 27(5): 570-581. http://dx.doi.org/10.1093/fampra/cmq043 Ryan A, Wilson S, Taylor A, Greenfield S. Factors associated with self-care activities among adults in the United Kingdom: a systematic review. BMC Public Health 2009; 9: 96. http://dx.doi.org/10.1186/1471-2458-9-96