Table 1. Demographic characteristics of the sample.

	Patients	Controls
Sex ratio (M/F)	26 (14∶12)	26 (14∶12)
Mean age (S.D.)	33 (11)	33 (11)
Age range	18–59	18–59
Handedness
R/M/L	15/8/3	14/9/3
(% R/M/L)	(58%/31%/11%)	(54%/35%/11%)

M: male. F: female. S.D.: standard deviation. R: right. M: mixed. L: left.