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Numerous evaluation studies have reported large accident reductions when road accident blackspots are treated. A critical examination of these studies reveals that many of them do not account for the effects of well known confounding factors, like the regression-to-the-mean effect that is likely to occur at road accident blackspots. This paper shows that the more confounding factors evaluation studies...
All randomized trials of cholesterol lowering except those without information on total mortality or cholesterol reduction were included in this meta-analysis. Its purpose was to review the relationship between log odds ratio of total mortality in active vs. control group and degree of cholesterol reduction, adjusting for appropriate covariates such as type of trial (single or multifactor), risk...
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