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Corrections to the target and critical values for the National Institute for Occupational Safety and Health validation tests.

In 1974 the National Institute for Occupational Safety and Health (NIOSH) and the Occupational Safety and Health Administration joined to complete exposure standards promulgated by federal regulations. In that effort NIOSH scientists developed an accuracy criterion (AC) and a statistical protocol for evaluating its fulfillment. That AC and those procedures have been widely used ever since. This article presents corrections to the target and critical coefficients of variation published as part of the statistical protocol.