Population Health Research Institute, St George's University of London, London, UK.
School of Population Health and Environmental Sciences, King's College London, London, UK.
Health Expect. 2021 Jun;24(3):1009-1014. doi: 10.1111/hex.13248. Epub 2021 Mar 28.
There are few UK data on the prevalence and clustering of risky behaviours in ethnically diverse adolescents.
To investigate the prevalence of reported alcohol use, smoking and vaping, and explore whether these behaviours are associated with increased numbers of sexual partners.
Questionnaire survey of 'Test n Treat' chlamydia screening trial participants.
Sexually active students attending six London technical colleges completed confidential questionnaires and provided genitourinary samples.
The median age of the 509 participants was 17 years (IQR: 16-18), 47% were male, 50% were of black ethnicity, 55% reported ≥2 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. A larger percentage of students with ≥2 sexual partners than 0-1 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: 1.11-1.61) and smoking cigarettes (36.6%, 100/273% versus 30.2%, 67/222, 1.34 (1.05-1.70)). By contrast, multiple sexual partners were not associated with vaping or chlamydia infection, but numbers were small.
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.
Participants helped with study design, conduct and interpretation.
英国关于不同族裔青少年中危险行为的流行率和聚集情况的数据很少。
调查报告的饮酒、吸烟和蒸气吸入行为的流行率，并探讨这些行为是否与性伴侣数量的增加有关。
对“Test n Treat”衣原体筛查试验参与者进行问卷调查。
在伦敦六所技术学院参加的性活跃学生完成了机密问卷，并提供了泌尿生殖样本。
509 名参与者的中位年龄为 17 岁（IQR：16-18），47%为男性，50%为黑人，55%报告过去一年有≥2个性伴侣（67%为男性，45%为女性），6.2%有衣原体感染，0.6%有淋病。近一半（48%）报告过去一个月喝醉，33%吸烟，7%曾蒸气吸入。与有 0-1 个性伴侣的学生相比，有≥2 个性伴侣的学生报告过去一个月喝醉的比例更高（53.7%，144/268%与 42.2%，94/223%，调整后的流行率比：1.33，95%置信区间：1.11-1.61）和吸烟（36.6%，100/273%与 30.2%，67/222%，1.34（1.05-1.70））。相比之下，多个性伴侣与蒸气吸入或衣原体感染无关，但数量较少。
我们发现危险行为的流行率很高，并且多个性伴侣与吸烟和/或醉酒有关。这些发现支持在英国中学引入强制性的性和关系教育，包括有关酒精和吸烟的不良影响的信息。
参与者帮助研究设计、进行和解释。
