Dear Freesurfer experts,
1. I want to compare the area and/or areapial between two groups in qdec menu. I think that the eTIV or total surface area should be used as a covariate. Which is more appropriate between eTIV and total surface area?
2. Is there any guideline or rule for the smoothing in the thickness, area, and volume comparison? How about the smoothing=5?
Thank you.
Best, Seung-Gul
--- *Seung Gul Kang, M.D., Ph.D. *
*Psychiatrist, Associate Professor*; Department of Psychiatry, Gil Medical Center, Gachon University, School of Medicine, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, South Korea *Research scholar*; Sleep Disorders Clinical Research Program, Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, 1 Bowdoin Square, 9th floor, Boston, MA 02114, USA *Collaboration researcher*; Division of Sleep & Circadian Disorders, Brigham & Women's Hospital, Harvard Medical School, 221 Longwood Ave, Boston MA 02115 ᐧ