Table 2. Multivariate Cox Proportional Hazard Model Evaluation of Mortality.

	Hazard Ratio	Confidence Interval	P Value
Age at initial visit (years)	1.02	0.98–1.05	0.053
Sex	0.75	0.18–2.23	0.371
Typical rashes	1.01	1.00–1.02	0.065
Skin ulcers	1.57	0.63–3.90	0.059
Creatine kinase at initial visit	1.07	0.33–3.49	0.704
Complicated with ILD	2.52	1.76–6.03	0.021*
Cardiac involvement	0.51	0.12–1.04	0.447
HMGB1 level (cutoff 14.5ng/ml)	2.10	1.13–5.52	0.023*

*<0.05