Table 1.

Participant characteristics by age decade in cross-sectional and 3-occasion longitudinal data

Decade	N	Age	Sex	Health	Educ	MMSE	Est. lQ	T1–T3 lnt.
Cross Sectional
20’s	915	23.1 (3.2)	.58 (.49)	2.0 (0.9)	14.6 (2.1)	28.8 (1.7)	106.4 (12.5)	NA
30’s	510	34.3 (2.8)	.69 (.46)	2.1 (0.8)	15.7 (2.9)	28.5 (1.8)	107.3 (15.2)	NA
40’s	792	45.0 (2.9)	.71 (.45)	2.2 (0.9)	15.2 (2.7)	28.4 (1.9)	107.4 (15.6)	NA
50’s	1166	54.5 (2.8)	.71 (.46)	2.2 (0.9)	15.7 (2.6)	28.3 (2.0)	109.3 (15.2)	NA
60’s	907	64.1 (2.8)	.66 (.48)	2.1 (0.9)	16.3 (2.8)	28.4 (1.9)	111.7 (13.5)	NA
70’s	567	74.2 (2.8)	.58 (.49)	2.4 (0.9)	15.9 (2.9)	28.1 (1.9)	109.3 (13.5)	NA
80’s	241	83.0 (2.5)	.51 (.50)	2.6 (0.8)	16.1 (3.1)	27.2 (2.5)	105.9 (13.8)	NA
All	5098	50.6 (18.0)	.65 (.48)	2.2 (0.9)	15.6 (2.7)	28.4 (1.9)	109.2 (14.3)	NA
Longitudinal
20’s	124	23.0 (3.5)	.62 (.49)	2.0 (0.9)	14.1 (2.0)	28.5 (1.8)	106.6 (13.1)	6.0 (2.2)
30’s	121	34.9 (3.0)	.75 (.43)	2.3 (0.8)	15.5 (2.4)	28.2 (1.9)	107.3 (17.4)	6.3 (2.2)
40’s	298	45.2 (2.9)	.70 (.46)	2.1 (0.9)	15.4 (2.4)	28.5 (1.7)	109.2 (15.2)	6.4 (2.2)
50’s	454	54.3 (2.9)	.72 (.45)	2.1 (0.9)	16.0 (2.7)	28.6 (1.7)	112.5 (14.8)	5.9 (1.9)
60’s	382	64.1 (2.8)	.67 (.47)	2.1 (0.9)	16.5 (2.6)	28.7 (1.6)	113.8 (13.3)	5.6 (1.7)
70’s	183	74.0 (2.9)	.59 (.49)	2.3 (0.9)	16.3 (2.9)	28.6 (1.6)	113.3 (13.0)	5.6 (1.7)
80’s	36	82.8 (2.6)	.50 (.51)	2.5 (0.8)	16.6 (4.0)	27.8 (2.0)	111.1 (11.7)	5.3 (1.8)
All	1598	54.0 (14.6)	.68 (.47)	2.2 (0.9)	15.9 (2.7)	28.6 (1.7)	111.5 (14.5)	5.9 (2.0)

Note: Values in parentheses are standard deviations. Sex refers to proportion of females, health is a self-rating on a scale from 1 for excellent to 5 for poor, Educ is years of education, MMSE is score on the Mini Mental State Exam (Folstein et al., 1975), Est. IQ is an estimate of IQ based on age-adjusted scores on three tests found to be highly related to Wechsler IV full scale IQ (Salthouse, 2014b), and T1–T3 Int. is the number of years between the first and third longitudinal occasion. NA indicates that the estimate is not applicable