Table 1.

Mean cognitive z-scores and percentage of patients completing each test. *Normative data reference average performance to a percentile above 50

	Cognitive variable	% available data	Mean z-score
Executive
Initiation	Verbal fluency (animals)	93	− 0.58
	Verbal fluency (P)	93	− 0.59
Flexibility	TMT B time (sec)	96	− 1.10
	TMT B-A time	97	− 0.77
	TMT B-A errors	85	− 0.71
Inhibition	Stroop test interference score (IS), time	87	− 1.24
	Stroop test interference-denomination, time	84	− 0.93
	Stroop test IS, non-corrected errors	65	− 0.45
Working memory	Digit span forward	97	− 0.50
	Digit span backward	97	− 0.51
	Visual span forward	56	− 1.51
	Visual span backward	56	− 1.26
Attention/processing speed
Selective attention	D2 GZ	59	− 0.80
	D2 F%	59	0.20
	D2 Gz-F	59	− 0.77
Processing speed	WAIS code	69	− 0.60
	TMT A time (sec)	98	− 0.46
	Stroop denomination time (sec)	90	− 1.17
	Stroop reading time (sec)	89	− 1.54
Anterograde memory
Encoding/retrieval processes	FCRST immediate recall (/16)	97	0.0*
	FCRST free delayed recall (/16)	97	− 0.57
	BVMTR total recall (/36)	65	0.66
Storage process	BVMTR delayed recall (/12)	64	0.28
	FCRST total delayed recall (/16)	97	− 0.67