Table 3.
Screening performance characteristics of ACEP-recommended criteria (level one, two, and overall) for performing brain computed tomography scan in patients with minor head trauma
| Characters | Level one | Level two | One + two (0verall) | |||
|---|---|---|---|---|---|---|
| Value | 95% CI | Value | 95% CI | Value | 95% CI | |
| Sensitivity | 29.61 | 13.75 - 50.18 | 89.49 | 66.86 -98.70 | 92.59 | 75.71- 99.09 |
| Specificity | 86.28 | 82.68- 89.14 | 26.33 | 21.95- 31.95 | 26.41 | 22.51- 30.65 |
| PPV | 11.00 | 6.76 - 20.24 | 6.80 | 5.81- 7.94 | 7.80 | 7.06 - 8.80 |
| NPV | 94.00 | 92.88 - 95.55 | 97.70 | 91.88- 99.38 | 97.00 | 91.70 - 99.39 |
| PLR | 2.12 | 1.15 - 3.99 | 1.22 | 1.03 -1.44 | 1.30 | 1.12 - 1.42 |
| NLR | 0.81 | 0.64 - 1.05 | 0.39 | 0.10 - 1.48 | 0.32 | 0.07 - 1.07 |
| Accuracy | 80.59 | 76.50 - 84.43 | 30.21 | 25.41- 35.48 | 27.21 | 22.94 - 31.85 |
CI: Confidence interval; PPV: Positive predictive value; NPV: Negative predictive value; PLR: Positive likelihood ratio; NLR: Negative Likelihood Ratio.