Table 1:

Participant Demographics:

Abbreviations: SD = standard deviation; WTAR = Wechsler Test of Adult Reading.

Randomization Assignment	Period 1: 40 mg Period 2: Placebo	Period 1: Placebo Period 2: 40 mg	Period 1: Placebo Period 2: 60 mg	Period 1: 60 mg Period 2: Placebo
n	22	12	13	24
Average age in years (SD)	46.1 (11.4)	50.9 (12.4)	40.9 (14.1)	48.8 (11.7)
Number male (%)	20 (90.9%)	7 (58.3%)	9 (69.2%)	21 (87.5%)
Education, years (SD)	12.1 (1.9)	12.3 (2.7)	12.5 (2.8)	12.4 (2.4)
IQ from WTAR (SD)	92.2 (10.5)	96.9 (10.6)	96.0 (10.8)	94.4 (11.0)
Parent education, years (SD)	12.5 (3.1)	11.4 (2.4)	13.4 (3.2)	12.1 (3.6)
African American (%)	16 (72.7%)	5 (41.7%)	6 (46.1%)	15 (62.5%)
Caucasian (%)	6 (27.3%)	7 (58.3%)	5 (38.5%)	7 (29.2%)
Hispanic Ethnicity (%)	2 (9.1%)	3 (25%)	2 (15.4%)	2 (8.3%)