Table 3.
The diagnostic property of the degrees to discriminate poor outcome.
| Population / Variable | AUC, % (95% CI) | P | Cutoff* | Sensitivity, % (95% CI) | Specificity, % (95% CI) |
|---|---|---|---|---|---|
| Total population | |||||
| Cervical lordosis1 | 70.5 (63.8 to 76.7) | < 0.001 | ≤ 7 | 67.7 (54.9 to 78.8) | 65.5 (56.9 to 73.3) |
| Cervical lordosis2 | 76.5 (70.1 to 82.1 | < 0.001 | ≤-2 | 56.9 (44.0 to 69.2) | 89.9 (83.7 to 94.4) |
| Block only | |||||
| Cervical lordosis1 | 62.4 (47.1 to 76.1) | 0.132 | NA | NA | NA |
| Cervical lordosis2 | 73.4 (58.5 to 85.2) | 0.003 | ≤ -4 | 55.0 (31.5 to 76.9) | 92.6 (75.7 to 99.1) |
| Block and PRF | |||||
| Cervical lordosis1 | 73.6 (66.0 to 80.3) | < 0.001 | ≤ 7 | 77.8 (62.9 to 88.8) | 65.2 (55.6 to 73.9) |
| Cervical lordosis2 | 77.3 (70.0 to 83.6) | < 0.001 | ≤ 0 | 66.7 (51.0 to 80.0) | 84.8 (76.8 to 90.9) |
Abbreviation: AUC, area under curve; CI, confidence interval; NA, not applicable; Cervical lordosis1: C2-C7 cobb angle; Cervical lordosis2: the angle measured by the Jackson physiological stress line method SVA: sagittal vertical axis (cm).
* According to the Youden index.