|  | Rx |
---|
 |  | VF | No VF | Total |
---|
VFA | VF | 40 | 2 | 42 |
No VF | 6 | 342 | 348 |
Total | 46 | 344 | 390 |
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VF vertebral fracture, VFA Vertebral Fracture Assessment
- Patients with spondyloarthritis with or without VF who were diagnosed by radiography (Rx) or by VFA using dual X-ray energy absorptiometry are represented as absolute numbers. Agreement between VFA and Rx was excellent (κ = 0.898, standard error 0.036; p < 0.001). The diagnostic value of VFA in identifying Rx VF indicated sensitivity of 87 % [95 % confidence interval (CI) 74–95 %], specificity of 99 % (95 % CI 98–100 %), positive predictive value of 95 % (95 % CI 84–99 %), and negative predictive value of 98 % (95 % CI 96–99 %)