Results of the Cox proportional hazard survival analysis.
| Characteristics | β | HR | 95% CI | p |
|---|---|---|---|---|
| Unadjusted model | ||||
| SSc-PM overlap diagnosis | 0.87 | 2.40 | 1.15–5.02 | 0.02 |
| Adjusted model | ||||
| SSc-PM overlap diagnosis | 0.85 | 2.34 | 1.09–5.02 | 0.029 |
| Age at diagnosis, yrs | 0.08 | 1.08 | 1.05–1.10 | < 0.001 |
| mRSS | 0.05 | 1.05 | 1.02–1.08 | < 0.001 |
| dcSSc involvement | 0.46 | 1.59 | 0.87–2.91 | 0.14 |
| Male | 0.43 | 1.53 | 0.95–2.47 | 0.08 |
SSc: systemic sclerosis; PM: polymyositis; mRSS: modified Rodnan skin score; dcSSc: diffuse cutaneous SSc.