TABLE 2.
TBI indicators of severity by TBI tier.; most recent head injury, National Concussion Surveillance System Pilota
| Probable TBI (tier 3), n = 716 |
Possible TBI (tier 2), n = 343 |
Delayed Possible TBI (tier 1), n = 93 |
Noncases (tier 0), n = 212 |
Statistically significant differences between tiers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Count | Weightedb, % or mean | 95% Cl | Count | Weightedb, % or mean | 95% Cl | Count | Weightedb, % or mean | 95% Cl | Count | Weightedb, % or mean | 95% Cl | ||
|
| |||||||||||||
| Evaluated for TBI Yes | 319 | 45.4% | 40.8%-50.1% | 74 | 20.9% | 15.5%-26.2% | 21 | 23.8% | 12.6%-35.1% | 32 | 14.5% | 8.6%-20.4% | c, d, e |
| Time to symptom resolution 1 day of symptoms | 133 | 15.8% | 12.7%-18.8% | 141 | 41.5% | 34.9%-48.2% | 41 | 42.0% | 29.9%-54.2% | f | f | f | c, d, e |
| Still having symptom OR had symptoms for 8+ days | 338 | 46.5% | 41.9%-51.1% | 72 | 18.9% | 14.0%-23.9% | 14 | 15.8% | 5.8%-25.8% | f | f | f | c, d, e |
| Extent of Impact: social functioning (mean) | 657 | 2.1 | 2.0–2.2 | 327 | 1.3 | 1.2–1.4 | 85 | 1.1 | 1.0–1.2 | 207 | 1.0 | 1.0–1.1 | c, d, e, g, h |
| Extent of Impact: work functioning (mean) | 659 | 2.2 | 2.1–2.3 | 329 | 1.4 | 1.3–1.5 | 83 | 1.2 | 1.1–1.3 | 207 | 1.1 | 1.0–1.1 | c, d, e, g, h |
Abbreviations: Cl, confidence interval; TBI, traumatic brain Injury.
Palrwlse differences between groups were tested using a univariate f statistic for continuous severity Indicators and χ2 tests for categorical severity Indicators.
Estlmates were weighted to correct for disproportionate sampling probabilities Introduced by the sampling design and to correct for differences in the demographic characteristics of the sample versus the population. Weighted estimates from this pilot work were not specifically Intended to produce nationally representative estimates of TBI.
Statistically significant difference (P < .05) between tiers 3 and 2.
Statistically significant difference (P < .05) between tiers 3 and 1.
Statlstlcally significant difference (P < .05) between tiers 3 and 0.
Not applicable. No analysis was conducted because no data were collected for these cases.
Statistical ly significant difference (P < .05) between tiers 2 and 1.
Statistically significant difference (P < .05) between tiers 2 and 0.