Table 3.

C‐Indexes of the ROC Curves, ROC Curves Comparison, IDI, and NRI of the ABC‐Stroke Score in Comparison With CHA₂DS₂‐VASc Score at 3.5 and 6.5 Years

	C‐Index	95% CI	P Value	z Statistica	P Valuea	IDI	P Value	NRI	P Value
At 3.5 y
ABC‐stroke score	0.663	0.634 to 0.690	<0.001	1.998	0.046	0.019	0.002	0.002	0.903
CHA2DS2‐VASc score	0.600	0.567 to 0.625	<0.001
At 6.5 y
ABC‐stroke score	0.662	0.633 to 0.690	<0.001	1.574	0.116	0.019	0.002	−0.053	<0.001
CHA2DS2‐VASc score	0.620	0.590 to 0.648	<0.001

ABC‐stroke indicates age, biomarkers (N‐terminal fragment B‐type natriuretic peptide, high‐sensitivity troponin), and clinical history (prior stroke/transient ischemic attack); CHA2DS2‐VASc, cardiac failure or dysfunction, hypertension, age ≥75 (doubled), diabetes mellitus, stroke (doubled)—vascular disease, age 65 to 74 years and sex category (female); IDI, integrated discriminatory improvement; NRI, net reclassification index; ROC, receiver operating characteristic.

^aFor C‐index comparison.