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Nonlinear associations between SII concentration and the prevalence of AF recurrence. When the SII concentration was greater than 444.77 × 109/L, the prevalence of AF recurrence increased with SII concentration. When the SII concentration was less than 444.77 × 109/L, the prevalence of AF recurrence reached a plateau. AF, atrial fibrillation; RCS, restricted cubic spline; RFCA, radiofrequency catheter ablation; SII, systemic immune‐inflammation index.
