Table 1.
Demographic characteristics of the current validation samples, and the combined validation and development samples.
| First Validation Sample | Second Validation Sample | Combined Validation Sample | Combined Development Sample | |
|---|---|---|---|---|
| Variable | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) |
| n | 55 | 52 | 107 | 200 |
| Age (years) | 74.1 (6.3) | 72.5 (4.9) | 73.3 (5.7) | 74.8 (6.7) |
| Education (years) | 15.4 (2.9) | 16.7 (2.1) | 16.1 (2.6) | 15.8 (2.6) |
| Gender (n) | ||||
| Males | 10 | 20 | 30 | 45 |
| Females | 45 | 32 | 77 | 155 |
| Race (n) | ||||
| Non-White/Non-Caucasian | 1 | 0 | 1 | 1 |
| White, Non-Hispanic | 54 | 52 | 106 | 199 |
| Test Interval (days) | 7.6 (1.9) | 6.8 (0.8) | 7.3 (1.5) | 7.4 (1.6) |
| WRAT Premorbid Intellect (SS) | 108.6 (8.0) | 110.6 (7.4) | 109.6 (7.7) | 108.2 (7.4) |
| RBANS Indexes (SS) | ||||
| Immediate Memory | 114.0 (13.2) | 107.5 (13.4) | 110.8 (13.6) | 108.1 (14.3) |
| Visuospatial/ Constructional | 101.1 (12.9) | 106.7 (13.8) | 103.9 (13.6) | 105.6 (14.2) |
| Language | 106.0 (10.8) | 104.4 (11.5) | 105.2 (11.1) | 104.5 (11.1) |
| Attention | 105.5 (13.2) | 108.8 (13.3) | 107.1 (13.3) | 105.6 (14.6) |
| Delayed Memory | 110.6 (8.1) | 110.6 (12.1) | 110.6 (10.2) | 108.6 (10.3) |
| Total Scale | 110.7 (12.1) | 110.9 (13.4) | 110.8 (12.7) | 109.2 (12.8) |
Note: WRAT Premorbid Intellect = Wide Range Achievement Test Reading Subtest, RBANS = Repeatable Battery for the Assessment of Neuropsychological Status, SS = Standard Score. Combined Development Sample was composed of the 107 participants from the Combined Validation Sample, along with the 93 cognitively intact participants from Duff’s (2014) development sample.