Table 1. McNemar test of the paired existence of the lumen in the lower rectum before and after aluminum potassium sulfate and tannic acid sclerotherapy.

Variable	On postoperative day 7			κ value (95% CI)	P value
	Lumen negative	Lumen positive	Total
Preoperatively, lumen negative	9	224	233	0.0027 (0.0001–0.0052)	<0.001
Preoperatively, lumen positive	0	8	8
Total	9	232	241

CI, confidence interval.