Table 3.
Differential diagnostic efficiency of SUVmax and qualitative scores (mean reference score compared to control) and clinical parameters with receiver operating characteristic analysis.
| Variable | AUC | P value | Sen (%) | Spe (%) | PPV | NPV |
|---|---|---|---|---|---|---|
| SUVmax | ||||||
| Interspinous ligament | 0.764 | 0.001 | 64.5 | 78.3 | 0.800 | 0.621 |
| Sacroiliac joint | 0.705 | 0.010 | 48.4 | 82.6 | 0.789 | 0.542 |
| Hip joint | 0.664 | 0.041 | 51.6 | 82.6 | 0.800 | 0.559 |
| Trochanter | 0.718 | 0.007 | 71.0 | 65.2 | 0.733 | 0.625 |
| Ischial tubercle | 0.753 | 0.002 | 83.9 | 56.5 | 0.722 | 0.722 |
| Combination | 0.832 | <0.001 | 90.3 | 69.6 | 0.800 | 0.842 |
|
| ||||||
| Mean ref. (control) score cases | ||||||
| Interspinous ligament | 0.712 | 0.008 | 83.9 | 56.5 | 0.722 | 0.722 |
| Sacroiliac joint | 0.658 | 0.048 | 67.7 | 60.9 | 0.700 | 0.583 |
| Trochanter | 0.663 | 0.042 | 51.6 | 82.6 | 0.800 | 0.559 |
| Symphysis pubis | 0.671 | 0.033 | 90.3 | 34.8 | 0.651 | 0.727 |
| Ischial tubercle | 0.730 | 0.004 | 83.9 | 56.5 | 0.722 | 0.722 |
| Combination | 0.794 | <0.001 | 90.3 | 60.9 | 0.757 | 0.824 |
|
| ||||||
| Clinical parameters | ||||||
| RF positive | 0.788 | <0.001 | 96.8 | 60.9 | 0.769 | 0.933 |
| AKA positive | 0.717 | 0.007 | 100.0 | 43.5 | 1.000 | 0.705 |
| anti-CCP Ab positive | 0.794 | <0.001 | 93.5 | 65.2 | 0.784 | 0.882 |
AUC: area under curve; SUV max: maximum standardized uptake value; Sen: sensitivity; Spe: specificity; PPV: positive predictive value; NPV: negative predictive value; RF: rheumatoid factor; anti-CCP Ab: anti-cyclic citrullinated peptide antibody.