Table 2.

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

Years since gastrectomy	No. in group	Observed lung cancer deaths (o)	Expected lung cancer deaths (e)	Ratio o/e	95% CI	p Value (2 sided)
0–4	2619	8	7.3	1.1	0.5 to 2.2	>0.05
5–14	2511	47	29.5	1.6	1.2 to 2.1	<0.01
15–24	2087	78	47.4	1.6	1.3 to 2.1	<0.001
25–34	1474	80	48.9	1.6	1.3 to 2.1	<0.001
35–59	825	49	27.2	1.8	1.3 to 2.4	<0.001
5–59	2511	254	152.9	1.7	1.5 to 1.9	<0.001

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

CI, confidence interval.