Table 2.
Item-Response Probabilities for Four Latent Classes of TBI Severity
| |
Latent class item-response probabilities |
|||
|---|---|---|---|---|
| Indicator | LC 1 |
LC 2 |
LC 3 |
LC 4 |
| (34.2%) | (36.0%) | (19.1%) | (10.7%) | |
| LOC pre-hospital | 0.37 | 0.33 | 1.00 | 0.93 |
| Hypotension | 0.02 | 0.00 | 0.07 | 0.13 |
| ED GCS total | ||||
| 3-8 | 0.00 | 0.03 | 0.62 | 0.93 |
| 9-12 | 0.04 | 0.03 | 0.17 | 0.07 |
| 13-15 | 0.96 | 0.94 | 0.21 | 0.00 |
| Hours to Motor GCS of 6 | ||||
| < 12 | 1.00 | 1.00 | 0.85 | 0.00 |
| 12-<24 | 0.00 | 0.00 | 0.07 | 0.20 |
| 24-<48 | 0.00 | 0.00 | 0.08 | 0.05 |
| ≥ 48 | 0.00 | 0.00 | 0.00 | 0.76 |
| Head AIS | ||||
| 0-2 | 0.99 | 0.00 | 0.13 | 0.03 |
| 3-4 | 0.00 | 1.00 | 0.74 | 0.60 |
| 5-6 | 0.01 | 0.00 | 0.13 | 0.37 |
| Rotterdam score 3-6 | 0.07 | 0.26 | 0.46 | 0.86 |
TBI, traumatic brain injury; LC, latent class; LOC, loss of consciousness; ED, emergency department; GCS, Glasgow Coma Scale; AIS, Abbreviated Injury Scale.