[Freesurfer] Interpretation of interaction effect in qdec

Hi FreeSurfer experts,

Let's say I have two class variables:

Sex (female, male) Dx (patient, control)

I see that the analysis results show the following:

Does the average thickness, accounting for Dx, diff between female and male? Red means: female > male Does the average thickness, accounting for Sex, diff between patient and control? Red means: patient > control Is there a Sex-Dx interaction in the mean thickness? Red means either (a) the female > male effect is stronger in patient (vs. control); or (b) the patient > control effect is stronger in female (vs. male)

Is my interpretation correct?

Thanks! Daniel

-- Yung-Jui "Daniel" Yang, PhD Postdoctoral Researcher Yale Child Study Center New Haven, CT (203) 737-5454