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Guyatt G, Rennie D, Meade MO, Cook DJ
Part B Therapy
Chapter 10.2. Understanding the Results: More About Odds Ratios
Roman Jaeschke, Stephen Walter, Mahmoud El Barbary, Gordon Guyatt
Table 10.2-8 Results From a Case-Control Study Examining the Association of Cutaneous Melanoma and the Use of Sunbeds and Sunlampsa

Topics Discussed: case-control studies, interpretation of results, odds ratios (relative odds), understanding the results

Excerpt: "Up to now, our examples have come from prospective randomized controlled trials. In these trials, we start with a group of patients who are randomly allocated to an intervention and a group of patients who are allocated to a control intervention. The investigators follow the patients over time and record the frequency of events. The process is similar in observational studies termed "prospective cohort studies," although in this study, the investigators do not control the exposure or treatment. For randomized trials and prospective cohort studies, we can calculate risks, odds, risk difference, RRs, ORs, and even odds reductions...."
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