Hi Bruce,
For subcortical volume, gender is not as a covariate(28 femaless and 26 males). Then, is it necessary to take gender as a covariate for cortical thickness, volume and surface area in qdec? Sincerely, Zheng At 2017-12-02 11:45:10, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote: >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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