Understanding of blood pressure and behaviourat risk factors amongst British adolescents

Objectives: To survey students aged 16-18 years in secondary education establishments in one school district in the south of England in order to: assess knowledge about the importance of blood pressure (BP) for health; investigate associations between knowledge and heatth-related behaviours; and explore home, school and health service influences on knowledge. Study design: Observational. Methods: Self-reported data from a structured questionnaire administered to convenience samples of students in schools were analysed by Chi-squared tests and multiple linear regression. The questionnaire assessed knowledge about BP risks, symptoms, consequences and measurement, and collected information on BP-related instruction, health behaviours (smoking, exercise, alcohol and nutrition) and family background. Results: A cross-section of 569 students completed questionnaires, representing 19.6% of the total age cohort. Most students recognized the major behavioural risks and consequences of high BP, but 104 (18.3%) could not describe how BP is measured, and 401 (88.1%) had no idea what a normal BP reading should be. In multivariate analysis, BP knowledge was associated with previous academic attainment, having received advice or instruction about BP, and having BP measured in the last 2 years. Family experience was not significant. Many students reported unhealthy behaviours: current smoker (n=87, 15.3%); less than three exercise sessions per week (n=172, 30.2%); and two portions or less of fruit/vegetables per day (n=223, 39.2%). BP knowledge was significantly associated with regular exercise but not with other health-promoting behaviours. One hundred and twenty-one (21.3%) students acknowledged having received instruction about BP, mainly from doctors/nurses (32%) and schools (28%). Conclusion: Gaps in adolescents' knowledge about BP were identified. Greater awareness was associated with having received format advice and instruction, so health services and schools could play an important part in improving BP knowledge among adolescents. More understanding of cumulative risks may encourage fuller engagement in health-promoting activities. (c) 2005 The Royal Institute of Public Health. Published by Elsevier Ltd. All rights reserved.