Fig. 3

Comparison of ROC curves between multivariate logistic regression models and reclassification analysis. Abbreviations: ROC, receiver operating characteristic; AUC, area under the curve; NRI, net reclassification improvement; IDI, integrated discrimination improvement; CI, confidence interval; OR, odds ratio. Comparison between two models in multivariate logistic regression analysis with complete cases (n = 409). Variables for model 1; conventional cardiovascular risk factors contain age, disease duration, body mass index, smoking habit, the current dose of prednisolone, dyslipidemia, arterial hypertension, and diabetes. Variables for model 2; adding anti-β2GPI/HLA-DR antibody cut-off to model 1. There was no significant difference with C-index improvement for the detection of arterial thrombosis, but continuous NRI and IDI were statistically significant