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. Author manuscript; available in PMC: 2017 Jun 30.
Published in final edited form as: Am J Psychiatry. 2011 Jul 1;168(9):894–903. doi: 10.1176/appi.ajp.2011.10111690

FIGURE 4. Comparison of Unstructured and Structured Age Cohortsa.

FIGURE 4

aThe left panel shows a frequency histogram of baseline ages of 157 patients with Alzheimer’s disease from the Alzheimer’s Disease Neuroimaging Initiative (ADNI), an example of an unstructured multicohort longitudinal design. The right panel shows a frequency histogram for a hypothetical structured multicohort longitudinal design with the same number of subjects and range of baseline ages as ADNI.