. 2012 Aug 27;39(5):1008–1017. doi: 10.1093/schbul/sbs078

Table 4.

Mean, Standard Deviation, and Effect Size of the Difference Over Time for across-Task iiv (iiv) Scores on the Computerized Neurocognitive Battery for in Healthy Comparison Subjects, Schizophrenia Patients, and Unaffected Family Members with Test at Both Time Points. Higher iiv Score Indicates Poorer Performance

IIV score^a	Healthy			Schizophrenia			Unaffected Family
Measure	Time 1	Time 2	d ^b	Time 1	Time 2	d ^b	Time 1	Time 2	d ^b
Accuracy	0.86 (0.30)	0.79 (0.24)^*	0.26	1.98 (1.33)	1.97 (1.29)	0.01	1.36 (1.00)	1.01 (0.54)^*	0.43
Speed	0.69 (0.32)	0.65 (0.39)	0.11	1.17 (0.49)	1.51 (1.05)	0.41	0.97 (0.60)	0.81 (0.47)^*	0.30

^aIIV was calculated for all individuals.²³

^bCohen’s d.

^* P < .05 as compared with Time 1 (less).