Table 1.

Observed and expected numbers of pancreatic cancer deaths in an Amsterdam cohort of 2633 patients (both sexes) after gastrectomy in consecutive postoperative intervals compared with the general Dutch population

Years since gastrectomy	No. in group	Observed pancreatic cancer deaths (o)	Expected pancreatic cancer deaths (e)	Ratio o/e	95% CI	p Value (2 sided)
0–4	2619	4	0.90	4.4	1.2 to 11.4	<0.05
5–14	2511	5	3.9	1.3	0.42 to 3.0	0.68
15–24	2087	8	6.1	1.3	0.56 to 2.6	0.54
25–34	1474	11	5.9	1.9	0.93 to 3.3	0.08
35–59	825	11	3.1	3.6	1.8 to 6.4	<0.01
5–59	2511	35	19.0	1.8	1.3 to 2.6	<0.01

The period of follow up is 1935–95; the age range of the patients is 10–84 years.

CI, confidence interval.