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Frequently in biomedical literature, measurements are considered "not statistically different" if a statistical test fails to achieve a P value that is 0.30. Our findings suggest that low power and a high incidence of type II errors are common problems in this journal. In addition, the presentation of statistics was often vague, t-tests were misused frequently, and assumptions for inferential statistics usually were not mentioned or examined.
Williams et al. (Tue,) studied this question.