Age-related decline in cognitive control: the role of fluid intelligence and processing speed

Table 4 Demographic data and cognitive assessment in subgroups of participants matched for 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
Processing speed matching	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

Mean raw scores ± standard deviations *p <.05; ** p <.001.
Student t tests reported in boldface shows no significant difference in fluid intelligence (p=.581)or in processing speed (p=.662) between subgroups of young and older adults that were respectively paired for these cognitive resources.

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