# Stratification Variables

Select one or more variables from the ADSL table by which to stratify the Cochran-Mantel-Haenszel exact test. Using such variables to stratify the analyses can help avoid confounding in the tests of interest.

Refer to PROC FREQ documentation for additional details.

### To Specify Stratification Variables:

| 8 | Select Specified Below as Trial Time Windows.

| 8 | Click to open the Add window (shown below) that lists each variable contained in ADSL or the domain and SUPPxx (if merged) specific to this report.

| 8 | Select the variables you want to include in the analysis and click to add those variables to the text box.

In this example, SEX was selected and added.