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Table 2- Purpose Categories (articles classified as original or review articles that were of interest to human health care were classified for purpose)

Purpose Category
Definition
Causation (Etiology)

Content pertains directly to determining if there is an association between an exposure and a disease or condition. The question is "What causes people to get a disease or condition?"

Prognosis

Content pertains directly to the prediction of the clinical course or the natural history of a disease or condition with the disease or condition existing at the beginning of the study.

Diagnosis

Content pertains directly to using a tool to arrive at a diagnosis of a disease or condition.

Therapy

Content pertains directly to an intervention for therapy (including adverse effects studies), prevention, rehabilitation, quality improvement, or continuing medical education.

Costs

Content pertains directly to the costs or financing or economics of a health care issue.

Economics

Content pertains directly to the economics of a health care issue (subset of cost articles).

Clinical Prediction Guide

Content pertains directly to the prediction of some aspect of a disease or condition.

Qualitative

Content relates to how people feel or experience certain situations, and data collection methods and analyses are appropriate for qualitative data.

Something else

Content of the study does not fit any of the above definitions.