Use this field to specify additional variables across the meta-analysis that identify effects.This field is used only when one or more of the data sets selected, after the first, uses a variable with another name for the Effect Estimate or Direction Variable . All variable names for the 2 nd through the last data set must be specified here.
For example, to specify the additional effect variables Disease_1 and Disease_2 , type Disease_1 Disease_2 in the text box, as shown below: