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bias
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This could have led to uncertainties in the exposure assessment, biasing the effect estimates toward null. For example, despite the fact that Wal-Mart employees are far more likely to be retired, secondary workers or teenage members of a family, and to work part time, the study assumed they had the same demographic composition as workers at other employers, thus biasing wage and other comparisons. Because the other two arms of this trial are continuing, the DSMB released the least amount of information necessary, to avoid any risk of biasing study results. |
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