From: Age-related decline in cognitive control: the role of fluid intelligence and processing speed
 | Gender ratio [Male/female] | Age | Educational level [Years completed] | Mill hill [Crystallized intelligence] | Raven’s advanced progressive matrices [Fluid intelligence] | Code test (WAIS-III) [Processing speed] | Mattis dementia rating scale | |
---|---|---|---|---|---|---|---|---|
Fluid intelligence matching | Young adults (n = 25) | 14/11 | 21.64 ± 3.29 | 12.72 ± 2.07 | 19.56 ± 5.07 | 50.6 ± 1.78 | 79.52 ± 9.46 |  |
Older adults (n = 25) | 13/12 | 73.8 ± 7.05 | 15.04 ± 3.67 | 29.56 ± 2.52 | 50.32 ± 1.6 | 63.56 ± 9.93 | 141.92 ± 2.29 | |
Student t tests between young and older adults | t(48) = −2.753* | t(48) = −8.998** | t(48) = 0.606 | t(48) = 5.775** |  | |||
Processing speed matching | Young adults (n = 25) | 14/11 | 21.96 ± 2.41 | 13.08 ± 2.39 | 20.52 ± 4.96 | 50.12 ± 5.44 | 74.64 ± 7.47 |  |
Older adults (n = 29) | 12/17 | 70.72 ± 7.64 | 14.10 ± 2.69 | 28.86 ± 3.04 | 45.97 ± 7.81 | 71.07 ± 8.15 | 141.79 ± 2.31 | |
 | Student t tests between young and older adults | t(52) = −1.465 | t(52) = −7.777** | t(52) = 2.208* | t(52) = 1.651 |  |