Re: [Freesurfer] subcortical structures volume

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"

Re: [Freesurfer] subcortical structures volume

Hi Greve, Thanks for your help. I have 28 females and 26 males in one group. If it is necessary to take gender and eTIV as a covariate, I don't know how to take them as covariate in SPSS. Subcortical volume can be divided by eTIV, but for gender, I don't know how to do. And the mean age of

Re: [Freesurfer] subcortical structures volume

Yes, you should take those into account. Not sure what you mean by "which stat analysis". On 12/01/2017 07:50 PM, 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

Re: [Freesurfer] subcortical structures volume

Hi Bruce, I am so sorry that I am wrong. What I want to say is that It isn't necessary to corrected by sex. Is it right? Thanks a lot! Zheng 在 2017-12-03 02:51:03，"Bruce Fischl" 写道： >I think you probably should since you don't want whatever you find to

Re: [Freesurfer] subcortical structures volume

I think you probably should since you don't want whatever you find to only reflect differences in head size cheers Bruce On Sat, 2 Dec 2017, 郑凤莲 wrote: Hi Bruce,     I think I get it. I have 27 males and 28 females and 26 males. It isn't necessary to corrected by eTIV. Is it right? Thanks

Re: [Freesurfer] subcortical structures volume

Hi Bruce, I think I get it. I have 27 males and 28 females and 26 males. It isn't necessary to corrected by eTIV. Is it right? Thanks a lot ! Zheng At 2017-12-02 11:45:10, "Bruce Fischl" wrote: >Hi Zheng > >For volume, usually including eTIV reduces

Re: [Freesurfer] subcortical structures volume

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