Randomized trial evaluates quality appraisal processes in prognosis studies, suggesting improvements for biases.
Quality appraisal, a necessary step in systematic reviews, is incomplete in most reviews of prognosis studies. Adequate quality assessment should include judgments about 6 areas of potential study biases. Authors should incorporate these quality assessments into their synthesis of evidence about prognosis.
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Hayden et al. (2006) studied this question.
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