Table 4. Diagnostic accuracy of StEP for the identification of radicular LBP compared to the DN4 screening tool for neuropathic pain and spinal MRI.
| Measure of Accuracy | StEP (All Patients) | DN4, Ten Items | DN4, Seven Items | StEP (Patients with MRI) | Spinal MRIa |
| AUC, mean±standard error | 0.98±0.01 | 0.71±0.04b | 0.67±0.05b | 0.97±0.02 | 0.69±0.07b |
| Sensitivity | 92 (83–97) | 61 (49–72) | 68 (56–78) | 90 (79–97) | 86 (74–94) |
| Specificity | 97 (89–100) | 73 (60–83) | 56 (43–69) | 95 (77–100) | 41 (21–64) |
| Correctly diagnosed patients, number (%) | 129 (94) | 91 (66) | 86 (63) | 67 (92)c | 53 (73)c |
| Positive predictive value | 97 (90–100) | 73 (60–83) | 65 (54–76) | 98 (89–100) | 77 (64–87) |
| Negative predictive value | 91 (81–97) | 61 (49–72) | 59 (46–72) | 81 (61–93) | 56 (30–80) |
Values represent % (95% CI) unless otherwise noted.
a
Using deviation of a nerve root caused by disk herniation and moderate stenosis (≥2/3) of the spinal canal or a lateral recess as cutoff values.
b
p<0.001, when compared to the area under the ROC curve for StEP.
c
The spinal MR images of 73 patients were analyzed.