The percent area of vascularity from various ultrasound techniques (mean±SD, unit:%) and their diagnostic performance in detecting the RP-SSc patients
| Ultrasound techniques | RP-SSc patients (n=16) | Controls (n=16) | T-test p value | Area under the ROC | Specificity (%) | Sensitivity (%) |
| CDI dorsal | 7.2±8.0 | 17.5±9.4 | 0.001 | 0.80 | 89 | 78 |
| CDI ventral (25 mm2) | 9.1±10.4 | 29.6±13.3 | <0.0001 | 0.89 | 72 | 94 |
| CDI ventral (100 mm2) | 5.4±6.0 | 17.7±7.5 | <0.00001 | 0.90 | 89 | 78 |
| PDI dorsal | 3.2±3.6 | 10.2±7.8 | 0.001 | 0.81 | 83 | 78 |
| PDI ventral (25 mm2) | 6.1±7.9 | 16.9±9.8 | <0.001 | 0.82 | 94 | 56 |
| PDI ventral (100 mm2) | 3.7±4.7 | 10.5±5.4 | <0.001 | 0.84 | 100 | 56 |
| cSMI dorsal | 10.6±8.9 | 19.7±7.1 | 0.002 | 0.77 | 89 | 72 |
| cSMI ventral (25 mm2) | 12.9±8.8 | 25.2±6.7 | <0.0001 | 0.85 | 72 | 89 |
| cSMI ventral (100 mm2) | 6.3±5.1 | 13.3±3.2 | <0.0001 | 0.87 | 100 | 72 |
| mSMI dorsal | 7.7±2.8 | 8.5±3.7 | 0.48 | 0.53 | 33 | 89 |
| mSMI ventral (25 mm2) | 7.5±3.6 | 10.1±2.1 | 0.01 | 0.74 | 72 | 78 |
| mSMI ventral (100 mm2) | 3.7±2.3 | 5.8±1.4 | 0.003 | 0.77 | 100 | 50 |
CDI, colour Doppler imaging; cSMI, colour-coded superb microvascular imaging; mSMI, monochrome superb microvascular imaging; PDI, power Doppler imaging; ROC, receiver operating characteristic; RP, Raynaud’s phenomenon; SSc, systemic sclerosis.