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- W2304863478 abstract "Covariate adjustment can adjust for baseline differences in randomised controlled trials (RCTs) that may have arisen by chance. Furthermore, even if the groups do not differ significantly on any factors, using baseline variables that may be related to the outcome as covariates can reduce the within-group variance, thus increasing the accuracy of the estimates of treatment effects and the power of the statistical test. However, improper use of covariate adjustment can either magnify or diminish the difference between the groups. In RCTs, covariates must be chosen carefully and should not include variables that may have been affected by the treatment itself. The use of covariate adjustment in cohort studies is even more fraught and may result in paradoxical situations, in which there can be opposite interpretations of the results." @default.
- W2304863478 created "2016-06-24" @default.
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- W2304863478 date "2016-01-11" @default.
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- W2304863478 title "Control or overcontrol for covariates?" @default.
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- W2304863478 doi "https://doi.org/10.1136/eb-2015-102294" @default.
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