Users' Guides to the Medical Literature
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
case-control studies, interpretation of results, odds ratios (relative odds), understanding the results
"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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