ABC of hypertension: Blood pressure measurement: Part 1—Sphygmomanometry: factors common to all techniques

The caption to the diagram on p 981 of this article by Gareth Beevers and colleagues (21 April, pp 981-5) wrongly described the blood pressure pattern as normal. It should have read: “Example of ambulatory blood pressure pattern plotted by the DABL® Program showing a marked variability of blood pressure.”