Table 1: Incidence of cholecystectomy at intervals after LSG (laparoscopic sleeve gastrectomy).

Interval after LSG (months)Number of patients entering this intervalNumber of patients withdrawing during intervalNumber of patients with postoperative ultrasoundsNumber of patients exposed to risk#Number of patients who underwent cholecystectomyIncidence per interval
(cumulative incidence)
Total cumulative incidence
(95% CI)

01380013800.0%

 7/138 

   5.1%
(1.4%–8.7%)
<3138110132.500.0%
3 to <6127110121.500.0%
6 to <1211691111.510.9%
12 to <2410627792.566.5%
24+7373036.500.0%

Patients exposed to risk = Patients entering –   Patients withdrawing.