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Whether it's quitting smoking, reducing alcohol intake or making healthier dietary choices, many of us have habits we'd like to change. But it's really hard to know which treatment path to take. To advise their patients on the best of course of action, doctors sometimes compare treatments using something called the "number needed to treat" (NNT). In deciding whether to embark on a course of treatment, NNT can help. But the term is easily misunderstood by patients, and doctors as well. So it's useful to break down what NNT means.