Abstract
Over fifteen years after first reporting to the State of New York, the Harvard Medical Practice Study (HMPS) continues to have a significant impact in medical malpractice policy debates. In those debates the HMPS has come to stand for four main propositions. First, “medical injury… accounts for more deaths than all other kinds of accidents combined” and “more than a quarter of those were caused by substandard care.” Second, the vast majority of people who are injured as result of substandard care do not file a claim. Third, “a substantial majority of malpractice claims filed are not based on provider carelessness or even iatrogenic injury.” Fourth, “whether negligence or a medical injury had occurred… bore little relation to the outcome of the claims.”Medical malpractice researchers have long known that the HMPS provides far stronger support for the first two of these propositions than for the last two; the HMPS was not designed or powered to reach strong conclusions about the validity of medical malpractice claims.

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