{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T05:36:40Z","timestamp":1793165800132,"version":"4.5.0"},"reference-count":19,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2021,3,28]],"date-time":"2021-03-28T00:00:00Z","timestamp":1616889600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Health Expectations"],"published-print":{"date-parts":[[2021,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Context<\/jats:title><jats:p>There are few UK data on the prevalence and clustering of risky behaviours in ethnically diverse adolescents.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To investigate the prevalence of reported alcohol use, smoking and vaping, and explore whether these behaviours are associated with increased numbers of sexual partners.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>Questionnaire survey of \u2018Test n Treat\u2019 chlamydia screening trial participants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting and participants<\/jats:title><jats:p>Sexually active students attending six London technical colleges completed confidential questionnaires and provided genitourinary samples.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The median age of the 509 participants was 17\u00a0years (IQR: 16\u201018), 47% were male, 50% were of black ethnicity, 55% reported \u22652 sexual partners in the past year (67% of males and 45% of females) and 6.2% had chlamydia infection and 0.6% gonorrhoea. Almost half (48%) reported getting drunk in the past month, 33% smoked cigarettes and 7% had ever vaped.<\/jats:p><jats:p>A larger percentage of students with \u22652 sexual partners than 0\u20101 partners reported getting drunk in the past month (53.7%, 144\/268% versus 42.2% 94\/223, adjusted prevalence ratio: 1.33, 95% confidence interval: 1.11\u20101.61) and smoking cigarettes (36.6%, 100\/273% versus 30.2%, 67\/222, 1.34 (1.05\u20101.70)). By contrast, multiple sexual partners were not associated with vaping or chlamydia infection, but numbers were small.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We found high prevalences of risky behaviour and an association between multiple sexual partners and smoking and\/or getting drunk. Findings support the introduction of compulsory sex and relationship education in UK secondary schools, including information about the adverse effects of alcohol and smoking.<\/jats:p><\/jats:sec><jats:sec><jats:title>Public contribution<\/jats:title><jats:p>Participants helped with study design, conduct and interpretation.<\/jats:p><\/jats:sec>","DOI":"10.1111\/hex.13248","type":"journal-article","created":{"date-parts":[[2021,3,28]],"date-time":"2021-03-28T13:58:50Z","timestamp":1616939930000},"page":"1009-1014","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Alcohol use, cigarette smoking, vaping and number of sexual partners: A cross\u2010sectional study of sexually active, ethnically diverse, inner city adolescents"],"prefix":"10.1111","volume":"24","author":[{"suffix":"Dr","given":"Rosalie","family":"Bartholomew","sequence":"first","affiliation":[{"name":"Population Health Research Institute St George's 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