Cost-effectiveness plane of self-management of hypertension versus usual care and the Cost-effectiveness acceptability curve of self-management of hypertension versus usual care. (a) and (b) are cost-effectiveness planes showing the relationship between the incremental cost and incremental quality adjusted life years (QALYs) of self-management of hypertension compared with usual care. They show that most results are in the north-east and south-east quadrants. (c) and (d) depict the cost-effectiveness acceptability curve of self-management of hypertension versus usual care. They shows that the probability of self-management of hypertension being cost-effective compared with usual care was at least 99% if decision makers were willing to pay at least £20,000 (€23,000) per QALY gained for women or at least £8000 (€9280) for men. This probability dropped to 50% at around £5000 (€5800) per QALY gained for women and at around £4000 (€4640) per QALY gained for men.