Specify a control (reference) level of the treatment arm. The level that you specify is used as the reference against other levels of the Treatment Variable in the Cochran-Mantel-Haenszel exact test to screen events or interventions for difference in incidence.
Note: If you leave this field blank, the default level is “Placebo” or “Pbo” (both case insensitive) if found. Otherwise, it is the first sorted level.
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