Subjects in the brain gene array.

*The Global impairment score is an index of overall performance on the NNTC neuropsychological battery of tests on the last assessment prior to death. A score ≤4 is considered normal; scores of 5 through 9 indicate progressively severe neurocognitive impairment. See Methods for details. Values are Mean ± SD.
**Mean ± SD; different from Group B using Student’s t test, p<0.00001.
***Geographical locations are in the United States of America: NYC = New York City; TEX = Galveston/Houston, Texas; UCSD = San Diego, California; UCLA = Los Angeles, California.
****WT = Caucasian; BL = African American; HP = Hispanic; MAS = Mixed Asian/WT.
*****The subject identifying codes shown here were assigned specifically for this study and match those given on the Gene Array page of the NNTC website (http://www.nntc.org/gene-array-project). Other identifiers also are assigned in NNTC archives. Samples of the brain specimens from these subjects are available to the public through the NNTC, and may have alternative identification codes.