Fig. 5.

Kaplan–Meier curves of cumulative survival according to the prognostic score group for the two risk groups in the derivation cohort (A) and validation cohort (B). Low-risk group score < 7.55; High-risk group score ≥ 7.55. Prognostic score = 0.089 * BMI (Kg/m²) + 0.0125 * AF duration (months) + 0.1027 * LAD (mm) + 0.7928 * (1 if sex = female) + 0 (if sex = male) + 1.1318 * (1 if after nifekalant = AF rhythm) + 0 (if after nifekalant = sinus rhythm) – 0.8752 * (1 if after nifekalant = AFL or AT). Shaded area is 95% CIs of the cumulative incidence. AF, atrial fibrillation; AFL, atrial flutter; AT, atrial tachycardia