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. 2018 Jan 16;319(3):279–290. doi: 10.1001/jama.2017.20513

Figure 1. Selection of Surgical and Nonsurgical Patients for the Study Population.

Figure 1.

CHS indicates Clalit Health Services; BMI, body mass index.

aNot mutually exclusive.

bBy using a sequential stratification method, 1743 nonsurgical matched patients at index date, who subsequently (after matching) underwent a bariatric surgical procedure, were censored at the time of their surgery from the nonsurgical group and were not added to the surgical group.

cBy using a sequential stratification method, for each surgical patient 3 nonsurgical matches were selected (total nonsurgical patients, 25 155). Potential matches met all inclusion and exclusion criteria as the surgical patients, except for having bariatric surgery as of index date.