What happened at m18?

[mathieu...@icm-institute.org]

Hi,

I have noticed that the number of subjects which have a m18 visit (325) is fairly lower that the number at m24 (626) (the figures are taken from the LONI frontpage). Note that for other cases, the progression seems more logicacl (m06 slightly lower than bl, m12 slightly lower than m06, etc.). The only exception is m18. I don't see any reason for that (the exam occurs at different time for different subjects so there is no reason like the period of the year, etc.). This seems to be true for images and for diagnostic information. Any idea on what happened?

Thanks in advance,
Mathieu

[Naomi Saito]

Hi Mathieu,

You can view "Complete ADNI Study Schedule" document from http://adni.loni.usc.edu/methods/documents/ under Study Information. 

You can see that m18 observation is not for all subjects.  

Naomi Saito

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From: adni...@googlegroups.com <adni...@googlegroups.com> on behalf of mathieu...@icm-institute.org <mathieu...@icm-institute.org>
Sent: Wednesday, October 14, 2015 8:08 AM
To: Alzheimer's Disease Neuroimaging Initiative (ADNI) Data
Subject: [adni-data] What happened at m18?

 

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[mathieu...@icm-institute.org]

Great, this explains everything! Thanks for pointing this document, I totally missed it.