@article {Radcliffe265, author = {K W Radcliffe and S Ahmad and G Gilleran and J D C Ross}, title = {Demographic and behavioural profile of adults infected with chlamydia: a case-control study}, volume = {77}, number = {4}, pages = {265--270}, year = {2001}, doi = {10.1136/sti.77.4.265}, publisher = {The Medical Society for the Study of Venereal Disease}, abstract = {Objectives: To determine which demographic and behavioural parameters are independently associated with chlamydial infection in adults. Methods: Subjects were recruited prospectively from male and female attendees at a large clinic for sexually transmitted infections (STI). All subjects were tested for chlamydia and gonorrhoea and asked to complete a questionnaire addressing demography, sexual and non-sexual (including drug taking) behaviour, and history of STI. Cases were those attending with a new clinical episode and found to be infected with chlamydia, but who did not have gonorrhoea. A control group was selected randomly from those found to be negative on screening for both infections. Results: 986 cases and 1212 controls were recruited over one calendar year. The following were found to be independent risk factors for chlamydial infection on multivariate analysis (odds ratios with 95\% confidence intervals in parentheses): being unmarried (1.8; 1.1{\textendash}3.1); black Caribbean ethnicity (2; 1.5{\textendash}2.7). Increasing age, fewer partners, and higher reported use of condoms were associated with a lower risk of infection. Conclusion: Black Caribbeans are at increased risk from chlamydia after controlling for sexual behaviour and socioeconomic status. Future research should seek an explanation elsewhere{\textemdash}for example, in terms of differences in sexual mixing or effectiveness of healthcare interventions.}, issn = {1368-4973}, URL = {https://sti.bmj.com/content/77/4/265}, eprint = {https://sti.bmj.com/content/77/4/265.full.pdf}, journal = {Sexually Transmitted Infections} }