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But at some point they have to start studying opening moves, or in poker they have to start studying odds.
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a Compares four calendar periods studied; odds ratio represents odds per advancing calendar period.
The probability of a research finding being true is related to the pre-study odds of that finding being true.
For a confirmatory study with four to one pre-study odds, the chance that any positive effects are spurious is reduced to 25%.
The impact of combining low power and low pre-study odds has important consequences for the likelihood that the research finding is actually true.
In our analysis, we show that for exploratory studies with an average 20% power, together with average one in four pre-study odds that the effect being sought is actually true, the likelihood that any claimed effect (based on passing a conventional level of statistical significance) actually is true is only 50%.
The discordance between the data from observational studies (odds ratio 1.99; 95 % CI 1.53 2.59) and from randomized studies (odds ratio 1.15; 95 % CI 0.78 1.68) prevents the drawing of any definitive conclusion.
These possible explanations highlight the fact that crude study odds ratios included in the meta-analysis may differ in the degree to which they are affected by confounding and effect measure modification.
In the Rotterdam Study, odds ratio's for prevalent AMD were estimated with logistic regression analyses, and relative risks for incident AMD were estimated with Cox proportional hazards analyses.
In that study, odds ratio (OR) was chosen as the effect label instead of HR.
Where possible within-study odds ratios or annual risk estimates were calculated to enable comparisons to be made between studies.
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