Table 4.

C-statistics* (95% confidence intervals) for score discrimination by study cohort

Score	ORBIT-AF cohort	ROCKET-AF cohort	Risk categories
Full continuous model	0.69 (0.67, 0.72)	0.63 (0.61, 0.65)	–
ORBIT score	0.67 (0.64, 0.69)	0.62 (0.60, 0.64)	0–7
HAS-BLED score	0.64 (0.62, 0.67)	0.59 (0.57, 0.61)	0–9
ATRIA score	0.66 (0.63, 0.68)	0.60 (0.58, 0.62)	0–10

*C-index is calculated at 2 years.