RNPC3 and kidney disorder: The variables potentially associated with anti-Sm levels from the univariate analysis (at P ≤ 0.20) were Caucasian ethnicity (β = −0.060), ESR (β = 0.203), C-reactive protein (CRP) (β = 0.372), SLEDAI2K (β = 0.125), malar rash (β = −0.138), photosensitivity (β = 0.148), serositis (β = 0.277), renal disorder (β = 0.176), anti-RNP antibodies (β = 0.304), current corticosteroid dosage (β = 0.164), and use of immunosuppressants (β = 0.209).