Table 4.

Distribution of risk scores and risk classification in a prediction score (HEARTS-Score) for arterial–esophageal fistula in the derivation cohort.

Risk Score (6-Point Scoring System)				Risk Classification
Total Points	Patients (n = 146) *	AEF	Rate of AEF, %	Risk Category	Patients	AEF	Rate of AEF, % (95% CI)
0	15	0	0.0	Low risk	81	1	1.2 (0–6.7)
1	19	1	5.3
2	47	0	0.0
3	36	5	13.9	High risk	65	21	32.3 (21.2–45.0)
4	20	7	35.0
5	9	9	100.0
6	0	0	NA

AEF: arterial–esophageal fistula; NA: not applicable; 95% CI: 95% confidence interval; HEARTS-Score consists of hematemesis, active bleeding, renal function (serum creatinine level > 1.2 mg/dL), PT > 13 s, previous stent implantation; low risk is defined as a HEARTS-Score of 0–2 points, while high risk is defined as a HEARTS-Score of 3–6 points. * There were missing data in nine cases.