Complicated Gallstones after Laparoscopic Sleeve Gastrectomy

Table 1

Incidence of cholecystectomy at intervals after LSG (laparoscopic sleeve gastrectomy).

Interval after LSG (months)	Number of patients entering this interval	Number of patients withdrawing during interval	Number of patients with postoperative ultrasounds	Number of patients exposed to risk^#	Number of patients who underwent cholecystectomy	Incidence per interval; (cumulative incidence)	Total cumulative incidence; (95% CI)
0	138	0	0	138	0	0.0%	7/138; 5.1%; (1.4%–8.7%)
<3	138	11	0	132.5	0	0.0%
3 to <6	127	11	0	121.5	0	0.0%
6 to <12	116	9	1	111.5	1	0.9%
12 to <24	106	27	7	92.5	6	6.5%
24+	73	73	0	36.5	0	0.0%

#Patients exposed to risk = Patients entering – (1/2)   ∗  Patients withdrawing.