Definitely age. You don't need to adjust for volume since these are not volume/area/length measures that you're comparing. You should also check for any group differences in motion before you proceed and make sure your groups are matched in terms of motion. If you do separate t-tests for each tract, you'll need to adjust for multiple comparisons (by the number of tracts).
On Tue, 20 Aug 2013, Alan Francis wrote: > Hi Anastasia: > Just a quick question. When comparing FA, AD, RD etc between 2 groups, do we > need to use covariates like Intra Cranial > volume or AGE? > > If the answer is no, should I do an ANOVA or will T tests be sufficient? > > thank you, > > Alan > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
