Table 3. Significant variables observed on single factor unconditional logistic regression and variance inflation factor diagnosis.

Variables	VIF
Age (year)	1.082
Systemic lupus erythematosus duration (year)	1.073
SDI	1.102
Raynaud’s phenomenon	1.102
Tachypnea	1.177
Moist rales	1.155
Complement 3	1.191
Anti-double-stranded deoxyribonucleic acid	1.245
Anti-U1 ribonucleoprotein	1.051
VIF: Variance inflation factor; SDI: Systemic Lupus International Collaborating Clinics/American College of Rheumatology Damage Index.