Table 2 Frequency table and χ2 test for correlation between presence and absence of power Doppler sonography signals, and both joint swelling* (A) and joint tenderness† (B).
| PDS signal | |||
|---|---|---|---|
| Absent | Present | Total n(%) | |
| Joint swelling | |||
| Absent | 32 | 86 | 118 (61.5%) |
| Present | 13 | 61 | 74 (38.5%) |
| Total n (%) | 45 (23.4%) | 147 (76.6%) | 192 |
| Joint tenderness | |||
| Absent | 35 | 89 | 124 (64.6%) |
| Present | 10 | 58 | 68 (35.4%) |
| Total n (%) | 45 (23.4%) | 147 (76.6%) | 192 |
PDS, power Doppler sonography.
*χ2 = 1.810; p = 0.178.
†χ2 = 3.752; p = 0.053.