Critical appraisal of medical literature: second update.

This skill-testing exercise was created for the purpose of updating the teaching package, Critical Appraisal Package: Therapy, published by the College of Family Physicians of Canada in 1986. This exercise follows the same format as the original package: presentation of a clinical scenario, an article, a worksheet, and methodology notes. The article being evaluated concerns the effectiveness of antihistamine decongestants in the prevention of acute otitis media in children with colds.