Hi Zheng
For volume, usually including eTIV reduces the variance and increases power
more than you lose for having one additional regressor. Not sure about
gender - how unbalanced is your sample? You might be ok with just eTIV
Bruce
On Sat, 2 Dec 2017, 郑凤莲
wrote:
Hi professor,
I am using Freesurfer 6.0 and get the volume of subcortical structures. I
want to get the relationship between age and
volume. I only have one group, is it necessary to take gender and eTIV as a
covariate? If it is necessary, Which
statistical analysis should be used?
I really appreciate your help. Thanks a lot.
Sincerely,
Zheng
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