Table 1.

Demographic Characteristics of Participants

Demographic characteristic	Male	Female Follicular	Female Luteal
N	28	29	23
Age (mean ± SEM)	21.8 ± 0.7	22.1 ± 0.8	21.6 ± 0.7
BMI (mean ± SEM)	22.4 ± 0.4	22.3 ± 0.4	22.2 ± 0.3
Education (%)
High school	7	17	13
Partial college degree	68	52	57
College degree	21	28	26
Advanced degree	4	3	4
Full time student (%)	75	69	83
Race (%)
European American	54	52	74
African American	21	38	5
Asian American	18	3	17
Other	7	7	4
Current drug use (mean ± SEM)
Alcoholic drinks/wk*	4.4 ± 1.0	2.2 ± 0.6	1.2 ± 0.4
Caffeine drinks/wk	4.5 ± 1.5	5.7 ± 1.6	8.3 ± 2.8
Lifetime drug use (% ever used)
Stimulants	7	7	0
Sedatives	0	3	0
Hallucinogens	14	14	0
Opiates	36	45	30
Marijuana*	89	62	30
Inhalants	4	3	0

Notes: Asterisks indicate a significant difference between males and females tested in each phase, p<.001.

^*indicates a significant group difference (see Results section: Demographic Characteristics).