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Jonathan J Deeks Imperial Cancer Research Fund/NHS Centre
for Statistics in Medicine, Institute of Health Sciences, Oxford OX3
7LF
Correspondence to: J J Deeks J.Deeks@icrf.icnet.uk
| The first 150 words of the full text of this article appear below. |
Tests are routinely used in medicine to screen for,
diagnose, grade, and monitor the progression of disease. Diagnostic
information is obtained from a multitude of sources, including imaging
and biochemical technologies, pathological and psychological
investigations, and signs and symptoms elicited during history taking
and clinical examinations.1 Each of these items of
information can be regarded as a result of a separate diagnostic or
screening "test." Systematic reviews of evaluations of tests are
undertaken for the same reasons as systematic reviews of treatment
interventions: to produce estimates of test performance and impact
based on all available evidence, to evaluate the quality of published
studies, and to account for variation in findings between
studies.2-5 Reviews of studies of diagnostic accuracy
involve the same key stages of defining questions, searching the
literature, evaluating studies for eligibility and quality, and
extracting and synthesising data. However, studies that evaluate the
accuracy of tests have a
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