Table 3. Incidence Rate of Esophageal and Gastric Cancer in Study Population.

	Overall	Surgical group	Control group	IRR (95% CI)	P value
Follow-up, mean (SD), y	5.91 (2.28)	6.06 (2.31)	5.62 (2.20)	NA	NA
Time at risk, person-year	5 372 886	1 705 735	3 667 151	NA	NA
Esophageal cancer events, total No.	112	26	86
Incidence rate, cases per 100 000 population/y	2.1	1.5	2.3	1.54 (0.99-2.38)	.05
Gastric cancer events, total No.	225	57	168
Incidence rate, cases per 100 000 population/y	4.2	3.3	4.6	1.37 (1.01-1.85)	.04
Esophagogastric cancer events, total No.	337	83	254
Incidence rate, cases per 100 000 population/y	6.3	4.9	6.9	1.42 (1.11-1.82)	.005

Abbreviations: IRR, incidence rate ratio; NA, not applicable.