I wanted to ask if it is possible to run analysis in QDEC with more than 2 covariates for examples, instead of Age, I wanted to add depression scores or race? At the moment my qdec table has two groups, two covariates...

Class Group1
Class Group2
Variables Age PainMeasure

If it is not possible, what is other alternate method would you suggest I could use to run analysis to look at group differences in brain measures with covarying for Age and Race / Depression Score in FreeSurfer?