Patient demographics, comorbidities, injury burden and patterns, and hospital outcomes of the study population (all patients) and comparisons of patient cohorts experiencing ICUbb (ICUbb+) to those that did not (ICUbb−)
| All patients (n=2004) | ICUbb− (n=1891) | ICUbb+ (n=113) | P value | ||||
| Mean±SD age (years) | 52±23 | 52±23 | 64±18 | <0.01 | |||
| % male (n) | 64 (1274) | 63 (1199) | 66 (75) | 0.52 | |||
| Median CCI score (IQR) | 1 (0, 3) | 1 (0, 3) | 3 (1, 5) | <0.01 | |||
| % CCI score ≥5 (n) | 14 (281) | 13.3 (252) | 25.7 (29) | <0.01 | |||
| Significant injury (AIS score ≥2) | % | n | % | n | % | n | P value |
| Head | 50.7 | 1015 | 50.7 | 958 | 46 | 57 | 0.96 |
| Face | 1 | 19 | 1 | 19 | 0 | 0 | 0.28 |
| Neck | 1.7 | 34 | 1.8 | 33 | 0.9 | 1 | 0.49 |
| Thorax | 26.9 | 539 | 26.5 | 501 | 33.6 | 38 | 0.1 |
| Abdomen | 13 | 261 | 13.3 | 252 | 8 | 9 | 0.1 |
| Spine | 8 | 161 | 7.6 | 143 | 15.9 | 18 | <0.01 |
| Extremity—upper | 1.6 | 31 | 1.5 | 29 | 1.8 | 2 | 0.84 |
| Extremity—lower | 13.3 | 267 | 13 | 246 | 18.6 | 21 | 0.09 |
| External soft tissue/burn | 1 | 20 | 0.9 | 16 | 3.5 | 4 | <0.01 |
| Median ISS (IQR) | 17 (10, 24) | 17 (10, 24) | 19 (16, 26) | <0.01 | |||
| % ISS >25 (n) | 454 (22.7) | 21.9 (414) | 35.4 (40) | 0.01 | |||
| Median (IQR) ICU LOS (days) | 3 (2, 5) | 3 (2, 5) | 11 (6, 18) | <0.01 | |||
| Median (IQR) SD HLOS (days) | 6 (3, 12) | 6 (3, 11) | 19 (11, 32) | <0.01 | |||
| % mortality (n) | 3.6 (72) | 2.6 (49) | 20.4 (23) | <0.01 | |||
AIS, Abbreviated Injury Scale; CCI, Charlson Comorbidity Index; HLOS, hospital length of stay; ICUbb, intensive care unit bounce back; ISS, Injury Severity Score; LOS, length of stay.