Journal
POSTGRADUATE MEDICAL JOURNAL
Volume 80, Issue 941, Pages 140-147Publisher
BMJ PUBLISHING GROUP
DOI: 10.1136/pgmj.2003.012633
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Assessing the quality of an epidemiological study equates to assessing whether the inferences drawn from it are warranted when account is taken of the methods, the representativeness of the study sample, and the nature of the population from which it is drawn. Bias, confounding, and chance can threaten the quality of an epidemiological study at all its phases. Nevertheless, their presence does not necessarily imply that a study should be disregarded. The reader must first balance any of these threats or missing information with their potential impact on the conclusions of the report.
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