Table 5.
Influence of IP baseline characteristics on ultrasound parameters in men and women
| |
Broadband attenuation |
Speed of sound |
|---|---|---|
| |
(dB/MHz) |
(m/s) |
| βcoeff (95% Cl)a | βcoeff (95% Cl)a | |
| Symptom duration1 (years) |
0.3 (−0.7, 1.2) |
−0.7 (−3.2, 1.7) |
| Rheumatoid Factor+ |
|
|
| no |
Referent |
Referent |
| yes |
−4.0 (−9.8, 1.9) |
−4.9 (−19.7, 10.0) |
| Tertiles of swollen joint count |
|
|
| low |
Referent |
Referentb |
| mid |
−4.1 (−10.8, 2.7) |
−6.3 (−23.2, 10.7) |
| high |
−6.0 (−12.2, 0.1) |
−20.1 (−35.6, -4.6)* |
| Tertiles of tender joint count |
|
|
| low |
Referent |
Referent |
| mid |
2.4 (−4.3, 9.1) |
−4.3 (−21.1, 12.6) |
| high |
−1.9 (−8.5, 4.7) |
−13.3 (−29.9, 3.3) |
| Tertiles of both swollen & tender joint count |
|
|
| low |
Referent |
Referentb |
| mid |
−6.4 (−12.7, -0.2)* |
−13.7 (−29.6, 2.2) |
| high |
−5.3 (−12.0, 1.4) |
−16.1 (−33.1, 0.9) |
| Larsen score2 |
0.1 (−0.2, 0.3) |
−0.1 (−1.0, 0.7) |
| Erosions2 |
|
|
| no |
Referent |
Referent |
| yes |
0.9 (−8.3, 10.0) |
8.2 (−23.3, 39.7) |
| Satisfied ARA criteria (4/7 definition) |
|
|
| no |
Referent |
Referent |
| yes |
−7.8 (−13.4, -2.3)* |
−18.9 (−33.1, -4.8)* |
| Satisfied ARA criteria (tree definition) |
|
|
| no |
Referent |
Referent |
| yes |
−8.5 (−13.7, -3.2)* |
−18.7 (−32.1, -5.2)* |
| HAQ score |
−0.6 (−5.4, 4.3) |
−2.1 (−14.5, 10.3) |
| Steroids ≥3 months |
|
|
| no |
Referent |
Referent |
| yes | 7.3 (−0.7, 15.3) | 9.7 (−11.1, 30.6) |
aadjusted for age and sex; bp < 0.05 test for trend; *p < 0.05.
1Years between first symptom onset and ultrasound scan.
2Assessed in those with baseline radiographs (n = 27).