Table 2.

Reduced efficiency of evidence accumulation (EEA) in healthy controls vs. patients with psychiatric disorders.

		Comparison w/healthy controls				w/demographic controls
	EEA mean (sd)	t	df	p-value	Cohen's d	F	df	p-value
HC	0.3 (0.9)
ALL DX	−0.3 (0.9)	5.48	266	<0.001	0.67	30.8	1,263	<0.001
SZ	−0.7 (1.0)	6.57	174	<0.001	1.12	43.5	1,171	<0.001
BP	−0.04 (0.9)	2.38	176	0.02	0.40	5.9	1,173	0.02
ADHD	−0.1 (0.7)	2.91	170	0.004	0.51	8.9	1,167	0.003

EEA was significantly reduced across all disorder categories. HC, Healthy Controls; ALL DX, All three patient groups combined; SZ, Schizophrenia; BP, Bipolar Disorder; ADHD, Attention-deficit/hyperactivity Disorder. Demographic control variables are age, gender, years schooling.