Sensitivity, specificity, and diagnostic accuracy of BS compared with SPECT.
| Variable | Estimate | 95% CI |
| Cervical spine (n = 48) | ||
| Sensitivity (%) | 41.5 | (27.8, 56.6) |
| Specificity (%) | 100.0 | (64.6, 100.0) |
| Diagnostic accuracy (%) | 50.0 | (36.4, 63.6) |
| Thoracic spine (n = 34) | ||
| Sensitivity (%) | 50.0 | (29.0, 71.0) |
| Specificity (%) | 100.0 | (80.6, 100.0) |
| Diagnostic accuracy (%) | 73.5 | (56.9, 85.4) |
| Lumbar spine (n = 91) | ||
| Sensitivity (%) | 72.9 | (61.5, 81.9) |
| Specificity (%) | 100.0 | (84.5, 100.0) |
| Diagnostic accuracy (%) | 79.1 | (69.7, 86.2) |
| Sacroiliac joint (n = 91) | ||
| Sensitivity (%) | 38.2 | (23.9, 55.0) |
| Specificity (%) | 96.5 | (88.1, 99.0) |
| Diagnostic accuracy (%) | 74.7 | (64.9, 82.5) |
Abbreviations: BS, bone scan; SPECT, single photon emission computed tomography.
Note: Elevated uptakes identified on BS were consistently observed on SPECT, but only about half of the uptakes detected on SPECT were visible on BS alone.