Correlations for the POI mean sum score and the GSUS and PDUS mean sum score for the total cohort (healthy, n = 28 and OA/RA, n = 59).
| Variables | Coefficient of Correlation with POI, Mean Sum Score, r | Level of Significance |
|---|---|---|
| GSUS dorsal synovitis | 0.517* | p < 0.01 |
| GSUS palmar synovitis | 0.391* | p < 0.01 |
| GSUS dorsal + palmar synovitis | 0.473* | p < 0.01 |
| PDUS dorsal synovitis | 0.485* | p < 0.01 |
| PDUS palmar synovitis | 0.365* | p < 0.01 |
| PDUS dorsal + palmar synovitis | 0.486* | p < 0.01 |
↵* Coefficient of correlation (r) is significant. POI: photo optical imaging; GSUS: greyscale ultrasonography; PDUS: power Doppler ultrasonography; OA: osteoarthritis; RA: rheumatoid arthritis; GSUS dorsal + palmar synovitis: mean sum score of US in greyscale mode in dorsal and palmar view; PDUS dorsal + palmar synovitis: mean sum score of US in power Doppler mode in dorsal and palmar view; US: ultrasonography.