Table 5. Probability Statistics for the NIHTB-CB Tests Demographically-Adjusted Norms for TBI Subgroups Applying the ≤5th 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 | .83 | 0.69 | 0.54 | n/a | n/a | n/a | n/a | n/a |
| 1+ | .17 | 0.31 | 0.46 | 0.83 | 1.82 | 0.83 | 2.71 | 0.65 |
| 2+ | .05 | 0.18 | 0.38 | 0.95 | 3.60 | 0.86 | 7.60 | 0.65 |
| 3+ | .02 | 0.08 | 0.18 | 0.98 | 4.00 | 0.94 | 9.00 | 0.84 |
| 4+ | .00 | 0.05 | 0.07 | 1.00 | -- | 0.95 | -- | 0.93 |
| 5 | .00 | 0.03 | 0.01 | 1.00 | -- | 0.97 | -- | 0.99 |
| Crystallized Composite < 43 | n=78 | n=11 | n=20 | |||||
| 0 | 0.66 | 0.55 | 0.30 | n/a | n/a | n/a | n/a | n/a |
| 1+ | 0.34 | 0.45 | 0.70 | 0.66 | 1.32 | 0.83 | 2.06 | 0.45 |
| 2+ | 0.15 | 0.27 | 0.70 | 0.85 | 1.80 | 0.86 | 4.67 | 0.35 |
| 3+ | 0.06 | 0.09 | 0.35 | 0.94 | 1.50 | 0.97 | 5.83 | 0.69 |
| 4+ | 0.02 | 0.09 | 0.25 | 0.98 | 4.50 | 0.93 | 12.50 | 0.77 |
| 5 | 0.00 | 0.00 | 0.05 | 1.00 | -- | 1.00 | -- | 0.95 |
| Crystallized Composite 43-49 | n=204 | n=20 | n=22 | |||||
| 0 | 0.81 | 0.70 | 0.32 | n/a | n/a | n/a | n/a | n/a |
| 1+ | 0.19 | 0.30 | 0.68 | 0.81 | 1.58 | 0.86 | 3.58 | 0.40 |
| 2+ | 0.04 | 0.25 | 0.45 | 0.96 | 6.25 | 0.78 | 11.25 | 0.57 |
| 3+ | 0.02 | 0.15 | 0.14 | 0.98 | 7.50 | 0.87 | 7.00 | 0.88 |
| 4+ | 0.00 | 0.10 | 0.05 | 1.00 | -- | 0.90 | -- | 0.95 |
| 5 | 0.00 | 0.10 | 0.00 | 1.00 | -- | 0.90 | -- | 1.00 |
| Crystallized Composite 50-57 | n=229 | n=21 | n=27 | |||||
| 0 | 0.89 | 0.67 | 0.74 | n/a | n/a | n/a | n/a | n/a |
| 1+ | 0.11 | 0.33 | 0.26 | 0.89 | 3.00 | 0.75 | 2.36 | 0.83 |
| 2+ | 0.01 | 0.19 | 0.22 | 0.99 | 19.00 | 0.82 | 22.00 | 0.79 |
| 3+ | 0.00 | 0.10 | 0.19 | 1.00 | -- | 0.90 | -- | 0.81 |
| 4+ | 0.00 | 0.05 | 0.00 | 1.00 | -- | 0.95 | -- | 1.00 |
| 5 | 0.00 | 0.00 | 0.00 | 1.00 | -- | 1.00 | -- | 1.00 |
| Crystallized Composite 58+ | n=194 | n=22 | n=15 | |||||
| 0 | 0.93 | 0.77 | 0.80 | n/a | n/a | n/a | n/a | n/a |
| 1+ | 0.07 | 0.23 | 0.20 | 0.93 | 3.29 | 0.83 | 2.86 | 0.86 |
| 2+ | 0.01 | 0.05 | 0.13 | 0.99 | 5.00 | 0.96 | 13.00 | 0.88 |
| 3+ | 0.00 | 0.00 | 0.00 | 1.00 | -- | 1.00 | -- | 1.00 |
| 4+ | 0.00 | 0.00 | 0.00 | 1.00 | -- | 1.00 | -- | 1.00 |
| 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