The difference in blood pressure readings between arms and survival: primary care cohort study

An incorrect statement was published in the conclusion section of this paper by Christopher E Clark and colleagues (BMJ 2012;344:e1327, doi:10.1136/bmj.e1327). A difference in systolic blood pressure of more than 10 mm Hg or 15 mm Hg between arms was associated with an increased risk of cardiovascular and all cause mortality over 10 years [not reduced mortality and event free survival].