Table 5. Descriptive statistics, group comparisons, and effect sizes for individual NAB tests (demographically-adjusted T scores).

	Uncomplicated MTBI		Complicated MTBI
	M	SD	M	SD	p	d	Effect Size
Oral Production	50.6	8.5	50.5	8.6	.953	.02	Very Small
Naming	52.5	8.4	51.0	9.8	.532	.16	Small
Visual Discrimination	52.0	8.6	51.7	7.5	.888	.04	Very Small
Design Construction	54.5	9.6	54.6	9.1	.935	.02	Very Small
Digits Forwards	50.0	7.2	53.7	9.0	.083	.45	Medium
Digits Backwards	53.0	6.0	54.2	9.6	.538	.16	Small
Dots	57.6	7.1	56.3	7.7	.494	.18	Small
Driving Scenes	51.3	10.7	49.9	8.9	.589	.14	Very Small
N&L Efficiency Part D	51.4	10.1	50.4	13.3	.740	.09	Very Small
N&L Efficiency Part A	54.1	9.3	52.9	10.5	.647	.12	Very Small
N&L Efficiency Part B	54.4	7.1	53.0	9.4	.524	.16	Small
N&L Efficiency Part C	50.1	8.2	48.2	9.2	.410	.21	Small
List Learning Immediate	49.9	8.6	50.8	8.6	.691	.10	Very Small
Shape Learning Immediate	53.1	9.6	54.5	7.4	.534	.16	Small
Daily Living Immediate	47.8	9.4	51.9	9.6	.095	.43	Medium
Story Learning Immediate	49.7	9.1	50.9	9.9	.622	.13	Very Small
List Learning Delay	52.2	12.0	53.5	10.9	.652	.12	Very Small
Shape Learning Delay	52.4	8.8	53.0	9.4	.792	.07	Very Small
Daily Living Delay	46.1	13.0	48.3	9.5	.452	.19	Small
Story Learning Delay	50.5	6.3	50.6	7.4	.956	.01	Very Small
Mazes	53.0	7.3	52.0	7.4	.594	.14	Small
Categories	52.9	10.2	54.0	9.0	.673	.11	Very Small
Word Generation	53.5	11.2	50.0	8.7	.181	.35	Medium

Note: N = 62 (Uncomplicated MTBI, n = 31; Complicated MTBI, n = 31)

*Cohen’s [74] effect size (d): small (.20), medium (.50), large (.80).