Table 3

Prognostic factors for survival

VariableNUnivariable Cox hazard analysisMultivariable Cox hazard analysis
HR95% CIP valueHR95% CIP value
Age1.051.03 to 1.07<0.0011.061.03 to 1.08<0.001
Male128RefRef
Female2050.620.43 to 0.900.0120.750.51 to 1.110.158
Concomitant ILD1221.601.11 to 2.320.0121.651.12 to 2.420.012
RA and PMR520.970.56 to 1.670.9010.980.44 to 2.200.967
Primary vasculitis syndrome1161.631.12 to 2.360.0101.140.57 to 2.260.711
Systemic lupus erythematosus490.870.51 to 1.460.5892.070.94 to 4.580.071
Inflammatory myositis600.690.40 to 1.180.1771.150.52 to 2.540.722
Systemic sclerosis130.710.22 to 2.230.5520.810.22 to 2.960.746
Others430.820.21 to 3.230.775
Oxygen administration on admission760.840.52 to 1.350.465
  • Univariable and multivariable Cox proportional hazards regression analyses were performed.

  • ILD, interstitial lung disease; PMR, polymyalgia rheumatica; RA, rheumatoid arthritis; Ref, reference.