Table 3.

Coefficient alpha for each test in the Gibson Test of Cognitive Skills battery

Test	Age (years)						Overall
	6–8	9–12	13–18	19–30	31–54	55+
Long-term memory	0.91	0.92	0.93	0.92	0.91	0.93	0.93
Short-term memory	0.87	0.82	0.83	0.90	0.82	0.83	0.88
Visual processing	0.96	0.96	0.97	0.98	0.98	0.97	0.98
Auditory processing	0.95	0.95	0.95	0.96	0.95	0.95	0.96
Logic and reasoning	0.85	0.83	0.81	0.74	0.77	0.79	0.87
Processing speed	0.88	0.81	0.87	0.87	0.87	0.91	0.88
Word attack	0.93	0.92	0.89	0.83	0.86	0.85	0.93