| OR (95% CI) | ||||
| A | B | C | D | |
| x Ray of cervical spine | 0.81 (0.77 to 0.85) | 0.81 (0.54 to 1.2) | 0.64 (0.61 to 0.68) | 0.64 (0.42 to 1.01) |
| CT scan | ||||
| Head | 1.84 (1.78 to 1.9) | 1.84 (1.49 to 2.28) | 1.26 (1.20 to 1.33) | 1.26 (0.98 to 1.64) |
| Thorax | 0.94 (0.90 to 0.99) | 0.94 (0.80 to 1.11) | 0.87 (0.77 to 0.98) | 0.87 (0.67 to 1.12) |
| Abdomen | 1.33 (1.28 to 1.39) | 1.33 (1.09 to 1.64) | 1.00 (0.94 to 1.06) | 1.00 (0.78 to 1.27) |
| Abdominal ultrasonography | 1.53 (1.45 to 1.61) | 1.53 (1.06 to 2.20) | 1.25 (1.18 to 1.31) | 1.25 (0.91 to 1.72) |
| Diagnostic peritoneal lavage | 1.4 (1.34 to 1.46) | 1.4 (0.90 to 2.17) | 1.46 (1.38 to 1.55) | 1.46 (0.98 to 2.19) |
| Endotracheal intubation | 1.62 (1.53 to 1.73) | 1.62 (1.39 to 1.90) | 1.34 (1.25 to 1.43) | 1.34 (1.15 to 1.56) |
Each row shows the result of a separate multivariable analysis, adjusted for age, sex, race/ethnicity (white, black, Hispanic), type of insurance (self-pay, Medicaid, other types of insurance), type (blunt vs penetrating) and mechanism of injury, and injury severity score.
A, Complete case analysis, ignoring the clustering issue; B, complete case analysis, considering the clustering issue; C, using imputed data, ignoring the clustering issue; D, using imputed data, considering the clustering issue.