Doctors’ calculation skills below average

Most doctors couldn't calculate a positive predictive value if their mortality risk depended on it, research confirms.

In a damning indictment of medicos' numerical know-how, only 1 in 4 was able to correctly answer a statistical poser when put on the spot.

The question (see below), replicated from a classic 1978 report into doctors' statistical shortcomings, was put to 61 doctors and medical students from Boston, US. (Spoiler alert: if you don't want to see the answer, look away now).

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