Variable | N | Univariable Cox hazard analysis | Multivariable Cox hazard analysis | ||||
HR | 95% CI | P value | HR | 95% CI | P value | ||
Age | 1.05 | 1.03 to 1.07 | <0.001 | 1.06 | 1.03 to 1.08 | <0.001 | |
Male | 128 | Ref | Ref | ||||
Female | 205 | 0.62 | 0.43 to 0.90 | 0.012 | 0.75 | 0.51 to 1.11 | 0.158 |
Concomitant ILD | 122 | 1.60 | 1.11 to 2.32 | 0.012 | 1.65 | 1.12 to 2.42 | 0.012 |
RA and PMR | 52 | 0.97 | 0.56 to 1.67 | 0.901 | 0.98 | 0.44 to 2.20 | 0.967 |
Primary vasculitis syndrome | 116 | 1.63 | 1.12 to 2.36 | 0.010 | 1.14 | 0.57 to 2.26 | 0.711 |
Systemic lupus erythematosus | 49 | 0.87 | 0.51 to 1.46 | 0.589 | 2.07 | 0.94 to 4.58 | 0.071 |
Inflammatory myositis | 60 | 0.69 | 0.40 to 1.18 | 0.177 | 1.15 | 0.52 to 2.54 | 0.722 |
Systemic sclerosis | 13 | 0.71 | 0.22 to 2.23 | 0.552 | 0.81 | 0.22 to 2.96 | 0.746 |
Others | 43 | 0.82 | 0.21 to 3.23 | 0.775 | |||
Oxygen administration on admission | 76 | 0.84 | 0.52 to 1.35 | 0.465 |
Univariable and multivariable Cox proportional hazards regression analyses were performed.
ILD, interstitial lung disease; PMR, polymyalgia rheumatica; RA, rheumatoid arthritis; Ref, reference.