Table 1.
Demographic Information
| Mean | SD | Min | Max | |
|---|---|---|---|---|
| Total Sample | ||||
| N = 63 participants (20 males, 43 females) | ||||
| Age (years) | 63.13 | 8.23 | 51 | 81 |
| Education (years)a | 15.52 | 2.53 | 12 | 20 |
| WRAT-4 Standard Score | 107.11 | 9.71 | 88 | 135 |
| RBANS Standard Score | 101.90 | 11.97 | 72 | 129 |
| Whole Brain FBL (mm) sum | 1,105,049 | 193,781 | 748,708 | 1,570,893 |
| Sample with tract specific FBL | ||||
| N = 55 participants (16 males, 39 females) | ||||
| Age (years) | 62.60 | 8.18 | 51 | 81 |
| Education (years)a | 15.20 | 2.54 | 12 | 20 |
| WRAT-4 Standard Score | 106.89 | 9.97 | 88 | 135 |
| RBANS Standard Score | 102.11 | 12.50 | 72 | 129 |
| Cingulate gyrus segment of cingulum FBL (mm) sum | 17,123 | 3930 | 9069 | 25,984 |
| Hippocampal segment of cingulum FBL (mm) sum | 4552 | 1391 | 2292 | 8824 |
| Inferior fronto-occipital fasciculus FBL (mm) sum | 66,318 | 15,410 | 37,658 | 105,177 |
| Uncinate fasciculus FBL (mm) sum | 5892 | 1545 | 2887 | 9239 |
Definitions: RBANS Repeatable Battery for the Assessment of Neuropsychological Status, WRAT-4 Wide Range Achievement Test-4, FBL Fiber bundle length, SD standard deviation
a
The years of education was determined by the highest level of education completed, in years. Continuing education, trade school credits, and additional degrees at the same level (i.e., two bachelor’s degrees) were not counted toward the final number of education years