An anonymous reader writes to point out a software review of the kind you can't generally find in an app store. A group from Johns Hopkins checked the accuracy of the Instant Blood Pressure app, which has sold more than 148,000 copies, and purports to measure blood pressure with just an iPhone -- no cuff required -- and found it wanting, to put it mildly. In the researcher's study, published in JAMA Internal Medicine, the app missed elevated blood pressures four out of five times.
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