That sounds right to me.
Assuming you have the OLay set to the covariate
mean and the Thr set to the Tstat, then the max
intensity (i.e. the value that 'Jump' is based on)
will come from the OLay volume.
The magnitude of the numbers should come directly
from your covariate values (or differences, if
this is a 2-sample or paired t-test). Maybe you
are doing a comparison test, and the differences
are very small, though correlated with the subject
data.
Details of your command and covariate magnitudes
would help clarify this.
- rick