Hi Zheng
how uniform is your distribution? I'm hardly an expert on this, but I
wouldn't expect very large effects until you get into the older end of
that range. Have you scatter plotted your data?
Bruce
On Mon, 20 Nov 2017, 郑凤莲
wrote:
Hi Bruce,
Thank you for your help.
I have 54 subjects, aged from 21 to 71 and only one group. I want to
compare the change of
hippocampus volume with age. The results before and after doing the correction
for eTIV are the
same. Where is wrong? Or if there is no error, how can I explain it in
discussion?
Thanks,
Zheng
At 2017-11-20 04:55:49, "Bruce Fischl" <[email protected]> wrote:
>Hi Zheng
>
>yes, I see. Maybe the effect is smaller than you have the power to see, or
>there is no effect? You would need to give us more details for us to help.
>Are you correcting for eTIV? What measure are you comparing?
>
>cheers
>Bruce
> On Sun, 19 Nov 2017, 郑凤莲 wrote:
>
>> Hi Bruce,
>>
>> I am sorry for this situation.
>> In the first way, there was an statistical difference in left
hippocampus, but no difference
in
>> right hippocampus. In the second way, there was both no statistical
difference in left or
>> right hippocampus. I don't know what causes this result.
>> Can you understand me this time?
>>
>> Thanks,
>> Zheng
>>
>>
>>
>>
>> At 2017-11-18 22:58:56, "Bruce Fischl" <[email protected]> wrote:
>> >Hi Zheng
>> >
>> >no difference between what and what?
>> >
>> >cheers
>> >Bruce
>> >On Fri, 17 Nov 2017, 郑凤莲 wrote:
>> >
>> >> Hi professor,
>> >>
>> >> I am using Freesurfer for DTI data. When I run 'mri_segstats', I
>> >> got the result that there w
>> as
>> >> an obvious difference in left hippocampus, but no difference in right
hippocampus. Then, I run
>> >> segmentation of hippocampus subfields. The result showed there is no difference in total left
or
>> >> right hippocampus, and only in two right hippocampus subfields has
significant difference. Why
is
>> >> there inconsistent result in two means?
>> >> Thank you very much.
>> >>
>> >> Sincerely,
>> >> Zheng
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>>
>>
>>
>>
>>
>>
>>
_______________________________________________
Freesurfer mailing list
[email protected]
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.
