Hi Bruce,
Thanks for your advice. There are a part of the result. Blue color stands
women, and Red color stands men.
The number of the data is not enough large. Are they ok? May I use them in
my paper?
Thanks a lot !
Zheng
At 2017-11-20 10:15:49, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>Hi Zheng
>
>I would scatter plot age vs. volume, coloring men and women differently
>(or different symbols) with and without eTIV correction to get an idea of
>what is going on
>
>cheers
>Bruce
>
>
>On Mon, 20 Nov
>2017, 郑凤莲 wrote:
>
>> Hi Bruce,
>>
>> My data is loss from 35 to 40. But the uniform of sex is not well from 40
>> to 55 and from 56 to
>> 71. I did the correlation analysis between age and volume. I don't know how
>> I can explain this
>> problem.
>> Thanks again.
>>
>> Sincerely,
>> Zheng
>>
>>
>>
>>
>>
>> At 2017-11-20 09:35:45, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote:
>> >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" <fis...@nmr.mgh.harvard.edu> 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 differe
>> nce
>> >> 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" <fis...@nmr.mgh.harvard.edu>
>> >> >> 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 le
>> ft
>> >> 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
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>>
>>
>>
>>
>>
>>
>>
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