. Author manuscript; available in PMC: 2014 Aug 18.

Published in final edited form as: CNS Drugs. 2013 Aug;27(8):663–673. doi: 10.1007/s40263-013-0082-x

Table 1.

Demographic characteristics of the sample

Characteristics	All	Placebo first^a	Tolcapone first^a
N	20	9	11
Gender, males	11	6	5
Age (years), mean ± SD	32.7 ± 8.6	31.4 ± 8.2	33.3 ± 9.2
IQ, mean ± SD	106.5 ± 45.7	105.0 ± 7.7	111.8 ± 12.3
Years of education, mean ± SD	16.4 ± 2.6	16.0 ± 2.4	16.7 ± 2.8
Handedness^b	81.6 ± 7.5	70 ± 62	92 ± 22

IQ intelligence quotient

Placebo first: the number of subjects who received placebo in the first arm of the study; tolcapone first: the number of subjects who received tolcapone in the first arm of the study

Handedness was measured using the Edinburgh Inventory [52]