Table 1.

Descriptive Statistics for all Study Variables

Variable	Mean (SD) or % (n)
Sex (female)	58.3% (2457)
Social class	3.76 (1.29)
Self-reported personality
Neuroticism	1.56 (.43)
Extraversion	2.20 (.47)
Openness	2.23 (.38)
Agreeableness	2.43 (.38)
Conscientiousness	2.32 (.34)
Mother-rated personality
Neuroticism	−.02 (.72)
Extraversion	−.02 (.63)
Agreeableness	.05 (.61)
Conscientiousness	.05 (.76)
Age 16 Cognition
Vocabulary (n=4,142)	44.42 (12.04)
Reading (n=1,937)	56.27 (12.45)
Spelling (n=4,112)	166.00 (22.33)
Math (n=2,349)	38.17 (11.26)
Matrices (n=1,989)	9.01 (1.53)
Age 46 Cognition
Memory (n=2,871)	12.59 (2.92)
Fluency (n=2,872)	24.39 (6.12)
Speed (n=2,809)	352.52 (82.56)

Note. N=4,218. Social class ranged from 1 (unskilled) to 6 (professional). Personality self-reports were rated on a scale from 1 to 3. Mother-rated personality was the mean of standardized items.