Knowledge of blood pressure in a U.K. general public population.

Little is known about the general public's understanding of the role of blood pressure (BP) in contributing to heart disease and stroke. This study aimed to gain a wider understanding of the knowledge and awareness of BP in a selected London population. As part of a stroke awareness campaign, members of the public were offered BP testing and were asked about their knowledge and awareness of BP. Descriptive statistics were employed to explore knowledge and awareness of BP. χ2-test was run to explore the difference between knowledge and awareness of BP, and whether there was a difference in BP readings in normotensive and hypertensive participants. A total of 1019 participants (males 295; mean age 54 years, range 16-92) were recruited with a mean BP of 130/77 mm Hg. Over half (52%) of the total population was unable to correctly estimate an acceptable range of BP, and of that group 28% had a systolic BP (SBP) >140 mm Hg. Of the 31% self-reporting hypertension and on medication, over a quarter (27%) did not know the range for acceptable BP. A third were poorly controlled with a SBP >140 mm Hg. Mean SBP in the hypertensive participants who correctly estimated 'acceptable BP' was 3 mm Hg lower (147 mm Hg) than those who guessed incorrectly (150 mm Hg) (P<0.04). There remains a lack of understanding of BP in the general public population with individuals having little knowledge of an acceptable BP range. Hypertensive patients demonstrate a particularly poor understanding of BP. This study suggests that good knowledge of BP influences BP control in a hypertensive population and has important public health implications.