Table 4.
Performance of the referral strategies in the Leiden SPACE cohort using classification by ASAS axSpA criteria as the external standard
| 79 fulfilling the ASAS criteria 182 not fulfilling the ASAS criteria |
Correctly referred/correctly not referred patients |
||||
|---|---|---|---|---|---|
| Patients fulfilling the ASAS criteria referred by strategies (correctly referred) |
Patients not fulfilling the ASAS criteria not referred by strategies (correctly not referred) |
||||
| Strategy | LR+ | N out of 79 | Sensitivity | N out of 182 | Specificity |
| Brandt I | 1.12 | 79 | 1.00 | 19 | 0.10 |
| Brandt II | 1.29 | 77 | 0.97 | 44 | 0.24 |
| Brandt III | 2.37 | 71 | 0.90 | 113 | 0.62 |
| Hermann | 1.19 | 67 | 0.85 | 52 | 0.29 |
| MASTER | 3.00 | 60 | 0.76 | 136 | 0.75 |
| Braun IBP | 1.33 | 65 | 0.82 | 69 | 0.38 |
| RADAR | 2.34 | 71 | 0.90 | 112 | 0.62 |
| RADAR 2/3 | 1.66 | 31 | 0.39 | 139 | 0.76 |
| Braun two-step | 2.27 | 71 | 0.90 | 110 | 0.60 |
| Braun two-step alt. | 3.13 | 68 | 0.86 | 132 | 0.73 |
| CaFaSpA ≥1pt | 1.35 | 74 | 0.94 | 56 | 0.31 |
| CaFaSpA ≥2pt | 2.35 | 47 | 0.61 | 135 | 0.74 |
| ASAS | 1.20 | 79 | 1.00 | 30 | 0.16 |
alt, alternative; ASAS, Assessment in SpondyloArthritis international Society; axSpA, axial spondyloarthritis; IBP, inflammatory back pain; LR+, positive likelihood ratio; RADAR, Recognising and Diagnosing Ankylosing Spondylitis Reliably; SPACE, Spondyloarthritis Caught Early.