Table 3.

Model fit comparison with and without ARRS included

Model	Comparator	C-statistic (95% CI)	P-value
Model 1	n/a	0.864 (0.813–0.914)	n/a
Model 2	Model 1	0.877 (0.823–0.931)	<0.001
Model 3	Model 2	0.894 (0.853–0.935)	0.028
Model 4	Model 3	0.902 (0.865–0.938)	0.867

ARRS, Antibody Renal Risk Score.

C-statistics to test the predictive discrimination of antinuclear cytoplasmic Antibody Renal Risk Score (ARRS) for end-stage kidney disease (ESKD). P-value is for likelihood ratio tests.

Model 1: adjusted for age, sex, ANCA subtype, uPCR and eGFR.

Model 2: model 1 plus ARRS category.

Model 3: model 2 plus treatment modalities (plasma exchange, need for KRT at presentation, cyclophosphamide, and rituximab).

Model 4: model 3 plus the SIMD category.