Table 1.
Characteristics of Study Sample (N = 90)
| Total (N = 90) | Male (n = 25) | Female (n = 65) | |||
|---|---|---|---|---|---|
| Characteristics | M (SD) | Range | M (SD) | M (SD) | p-value |
| Age | 67.35 (6.1) | (60, 82) | 66.43 (6.8) | 67.71 (5.9) | .38 |
| Education | 14.23 (2.8) | (8, 20) | 15.04 (2.9) | 13.92 (2.7) | .09 |
| Race (N, % African-American) | 82 (91) | 22 (88) | 60 (94) | .53 | |
| GDS | 1.24 (1.9) | (0, 11) | 1.84 (.59) | 1.01 (.15) | .06 |
| Brain volume (mm3) | |||||
| Hippocampus | 6,756 (714) | 6,721 (785) | 6,770 (692) | .78 | |
| Amygdala | 2,890 (489) | 2,907 (477) | 2,884 (496) | .84 | |
| Thalamus | 12,273 (1,174) | 12,278 (1,400) | 12,271 (1,088) | .98 | |
| Late-life activities (count) | 18.39 (3.3) | (0, 7) | 18.04 (3.7) | 18.52 (3.2) | .54 |
| Early-life activities (count) | 3.02 (1.6) | (11, 25) | 3.20 (2.6) | 2.95 (2.5) | .53 |
Note: GDS = 15-item Geriatric Depression Scale. p-values are for t-tests/Fisher’s exact test for sex differences. Brain volumes adjusted for intracranial volume.