Table 4. Probability Statistics for the NIHTB-CB Tests Demographically-Adjusted Norms for TBI Subgroups Applying the ≤9^th Percentile Cut-off Score.

Number of Low Scores	Normative Sample Base Rate	Mild/Mod Base Rate	Severe Base Rate	Spec	LR + Mild/Mod	LR- Mild/Mod	LR+ Severe	LR - severe
Total Sample	n=793	n=74	n=84
0	.68	0.57	0.39	n/a	n/a	n/a	n/a	n/a
1+	.32	0.43	0.61	0.68	1.34	0.84	1.91	0.57
2+	.08	0.34	0.49	0.92	4.25	0.72	6.13	0.55
3+	.02	0.19	0.32	0.98	9.50	0.83	16.00	0.69
4+	.01	0.08	0.20	0.99	8.00	0.93	20.00	0.81
5	.00	0.07	0.10	1.00	--	0.93	--	0.90
Crystallized Composite < 43	n=78	n=11	n=20
0	0.43	0.36	0.10	n/a	n/a	n/a	n/a	n/a
1+	0.57	0.64	0.90	0.43	1.12	0.84	1.58	0.23
2+	0.28	0.55	0.75	0.72	1.96	0.63	2.68	0.35
3+	0.11	0.36	0.50	0.89	3.27	0.72	4.55	0.56
4+	0.06	0.09	0.40	0.94	1.50	0.97	6.67	0.64
5	0.01	0.09	0.20	0.99	9.00	0.92	20.00	0.81
Crystallized Composite 43-49	n=204	n=20	n=22
0	0.66	0.55	0.18	n/a	n/a	n/a	n/a	n/a
1+	0.34	0.45	0.82	0.66	1.32	0.83	2.41	0.27
2+	0.15	0.35	0.68	0.85	2.33	0.76	4.53	0.38
3+	0.04	0.25	0.41	0.96	6.25	0.78	10.25	0.61
4+	0.01	0.15	0.23	0.99	15.00	0.86	23.00	0.78
5	0.01	0.15	0.09	0.99	15.00	0.86	9.00	0.92
Crystallized Composite 50-57	n=229	n=21	n=27
0	0.74	0.62	0.56	n/a	n/a	n/a	n/a	n/a
1+	0.26	0.38	0.44	0.74	1.46	0.84	1.69	0.76
2+	0.06	0.33	0.30	0.94	5.50	0.71	5.00	0.74
3+	0.01	0.14	0.19	0.99	14.00	0.87	19.00	0.82
4+	0.00	0.10	0.07	1.00	--	0.90	--	0.93
5	0.00	0.05	0.07	1.00	--	0.95	--	0.93
Crystallized Composite 58+	n=194	n=22	n=15
0	0.85	0.64	0.80	n/a	n/a	n/a	n/a	n/a
1+	0.16	0.36	0.20	0.84	2.25	0.76	1.25	0.95
2+	0.03	0.23	0.20	0.97	7.67	0.79	6.67	0.82
3+	0.01	0.09	0.20	0.99	9.00	0.92	20.00	0.81
4+	0.00	0.00	0.13	1.00	--	1.00	--	0.87
5	0.00	0.00	0.00	1.00	--	1.00	--	1.00

Note: base rate= sensitivity, spec=specificity, LR + = Likelihood Ratio Positive, LR- = Likelihood Ratio Negative