fig4
Figure 4. Kaplan-Meier analysis of freedom from AF recurrence in the SAF group. The plot shows recurrence-free survival over follow-up time (months) according to postoperative BMI grade (BMI ≥ 28 kg/m2, 24 ≤ BMI < 28 kg/m2, and BMI < 24 kg/m2). The log-rank test yielded P = 0.006. The number of patients at risk in each BMI category is displayed below the plot. SAF: Persistent atrial fibrillation; BMI: body mass index; AF: atrial fibrillation
