Table 2. Univariate and multivariate analysis of risk factors in training cohort.

Factors	Univariate			Multivariate
	P	OR (95% CI)		P	OR (95% CI)
Age ≥50y	0.034a	2.200 (1.060, 4.568)		0.007*	3.534 (1.414, 8.831)
Sex	0.084a	1.864 (0.909, 3.780)		0.180	1.804 (0.761, 4.276)
Gottron’s sign	0.286	0.682 (0.337, 1.379)
Periochia erythema	0.888	1.081 (0.365, 3.205)
Poikiloderma	0.077a	2.241 (0.916, 5.486)		0.051	2.890 (0.994, 8.407)
Refractory itching	0.014a	3.267 (1.274, 8.378)		0.013*	4.642 (1.375, 15.671)
V-neck sign	0.857	1.067 (0.527, 2.163)
Periorbital erythema	0.507	1.295 (0.603, 2.781)
Raynaud’s phenomenon	>0.999	<0.001
Joint pain	0.165	0.408 (0.115, 1.449)
Proximal muscle weakness	0.769	0.892 (0.417, 1.908)
Dysphagia	<0.001a	4.224 (1.932, 9.233)		0.003*	4.223 (1.617, 11.023)
Interstitial pneumonia	0.033a	0.440 (0.207, 0.936)		0.031*	0.367 (0.147, 0.913)
Respiration failure	0.250	0.546 (0.195, 1.531)
CK ≥198U/L	0.002a	3.137 (1.521, 6.467)		0.049*	2.306 (1.003, 5.304)
LDH ≥300U/L	0.784	0.905 (0.443, 1.847)
ANA (+)	0.316	0.696 (0.343, 1.412)
Anti-Jo-1(+)	>0.999	<0.001
CA125 ≥35 U/ml	0.876	1.100 (0.331, 3.660)
CA19-9 ≥37 U/ml	0.042a	2.672 (1.034, 6.902)		0.319	1.811 (0.563, 5.824)

Notes.

OR

odds ratio

CI

confidence interval

^aP < 0.1.

^*P < 0.05, statistically significant difference.