Table 2.

Mean and SD (95% CI) for Gibson Test scales by age group

Test	Statistics	Age (years)						Overall
		6–8	9–12	13–18	19–30	31–54	55+
Long-term memory	n	392	943	545	204	379	156	2,619
	M	15.9	21.5	26.1	30.2	25.3	22.5	23.2
	SD	10.3	11.5	11.8	11.2	10.4	12.2	12.2
	95% CI	±1.0	±0.73	±1.5	±1.5	±1.0	±1.9	±0.46
Short-term memory	n	352	811	297	128	348	145	2,081
	M	27.4	37.9	43.7	48.7	45.1	38.7	38.9
	SD	11.2	9.2	9.3	11.4	9.2	9.3	11.5
	95% CI	±1.2	±0.63	±1.0	±1.9	±.96	±1.5	±0.49
Visual processing	n	373	835	308	155	400	166	2,237
	M	17.5	29.4	37.8	54.2	42.7	33.9	33.0
	SD	12.6	14.9	18.0	19.9	20.5	18.5	19.4
	95% CI	±1.3	±1.0	±2.0	±3.1	±2.0	±2.8	±0.80
Auditory processing	n	382	840	314	159	408	162	2,265
	M	27.3	38.3	47.5	57.1	54.9	48.9	42.8
	SD	18.8	20.0	19.2	18.1	18.3	18.5	21.5
	95% CI	±1.9	±1.3	±1.9	±2.8	±1.8	±2.8	±0.88
Logic and reasoning	n	365	822	301	129	354	151	2,122
	M	9.3	13.2	15.3	18.8	17.2	14.8	14
	SD	3.9	3.9	3.9	3.4	3.5	3.5	4.7
	95% CI	±0.40	±0.26	±0.44	±0.58	±0.50	±0.96	±0.27
Processing speed	n	362	819	301	123	353	155	2,115
	M	14.3	30.4	35.1	39.4	36.6	33.5	32.2
	SD	1.9	5.0	5.5	4.9	4.8	6.1	6.3
	95% CI	±0.19	±0.34	±0.62	±0.86	±0.50	±0.96	±0.26
Word attack	n	346	806	295	125	349	145	2,066
	M	24.6	35.3	41.6	46.9	46.2	44.3	37.6
	SD	14.7	13.6	10.9	7.8	8.8	9.2	14.2
	95% CI	±1.5	±0.48	±0.63	±0.69	±0.47	±0.76	±0.61

Abbreviations: CI, confidence interval; n, number in sample; M, mean score. SD, standard deviation.