Table 1. Participant Demographics and Mean Scores (SD in Parentheses) on Memory Span Tasks: Forward (F), Backward (B).
| Quartile | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Age (yrs) | ||||
| Range | 19–26 | 27–46 | 47–66 | 67–77 |
| M (SD) | 22.7 (2.7) | 39.3 (7.3) | 57.1 (7.4) | 71.5 (3.3) |
| Gender | 10 F 5 M | 5 F 10 M | 11 F 4 M | 9 F 6 M |
| Education (yrs) | 15.5 (1.2) | 14.5 (2.0) | 15.0 (2.9) | 12.4 (1.5) |
| % in education | 80 | 7 | 0 | 0 |
| % in employment | 20 | 73 | 27 | 0 |
| % retired/unemployed | 0 | 20 | 73 | 100 |
| Digit span | ||||
| F | 11.1 (2.9) | 9.9 (2.9) | 10.5 (2.6) | 8.9 (2.6) |
| B | 8.0 (2.5) | 6.3 (2.4) | 7.6 (2.7) | 5.9 (1.4) |
| Total | 19.1 (5.2) | 16.2 (4.9) | 18.1 (5.1) | 14.8 (3.5) |
| Corsi task | ||||
| F | 8.3 (1.9) | 7.3 (1.7) | 7.3 (1.4) | 7.0 (1.6) |
| B | 7.7 (1.5) | 6.7 (2.1) | 6.5 (1.5) | 6.1 (1.1) |
| Total | 15.9 (1.5) | 14.0 (3.3) | 13.8 (1.9) | 13.1 (2.3) |
| Total score | 35.0 (6.5) | 30.2 (6.8) | 31.9 (6.1) | 27.9 (4.9) |