Table 1.

Demographic and personality variables in the HCP sample (n=818 healthy volunteers).

Demographic variables
Gender (males / females)	367 / 451
Age (years)	28.7 ± 3.7 [22–37]
Handedness (Right / Left / Both)	743 / 73 / 2
Education (years)	14.9 ± 1.8 [11–17]
Ethnicity (%)	Hispanic / Latino	8.6 %
	Not Hispanic / Latino	90.5 %
	Unknown / Not Reported	0.9 %
Personality scores (NEO-FFI)
Neuroticism	16.3 ± 7.2 [0–43]
Extraversion	30.7 ± 5.9 [11–47]
Openness	28.3 ± 6.1 [12–45]
Agreeableness	32.0 ± 5.0 [13–45]
Conscientiousness	34.5 ± 5.9 [12–48]

Key to table. Age, education, and personality data are expressed as mean ± standard deviation while the range in parentheses [] is expressed as minimum-maximum. NEO five-factors inventory questionnaire, NEO-FFI.