Significance of retrospective studies.
Examples of retrospective studies are presented to demonstrate some facets of such studies, both good and bad, pointing out the need for good controls. Also important are a clear idea of the question to be answered, and careful planning around that answer as the study progresses.
D000230:Adenocarcinoma / Q000139:chemically induced; D004967:Estrogens; D005260:Female; D006323:Heart Arrest / Q000209:etiology; D006801:Humans; D007603:Jurisprudence; D008175:Lung Neoplasms / Q000209:etiology; D008297:Male; D010383:Pellagra / Q000209:etiology; D012189:Retrospective Studies; D012907:Smoking / Q000150:complications; D011795:Surveys and Questionnaires; D014625:Vaginal Neoplasms / Q000139:chemically induced
D004967:Estrogens