Table 1. Demographic characteristics of individuals without the 7R allele (7R−) and those with the 7R allele (7R+).

	7R− (n = 53)	7R+ (n = 29)
Age	35.4±9	35.8±8
BMI	25±4	25±3
Gender	21 F, 32 M	11 F, 18 M
Ethnicity
AA	17	14
C	23	10
Others	13	5
IQ	100±11	102±9
SES	36±12	38±14
PEM	50±10	53±8
§Achievement	12±5	15±3*
§Control	15±5	19±3**
§Beck	3±5	4±5

^*Differences between groups *p<0.05; ** 0.001.

^§Personality measures were obtained in 50/53 7R− and 27/29 7R+. AA = African American, C = Caucasian, Others = Asian, Native American.