Table 3 Standardised incidence ratios (SIRs) and their 95% CIs for oesophageal cancer by histology among unoperated patients with gastric ulcer, by follow‐up duration, sex, presence of complications and calendar year of index hospitalisation*.

	Adenocarcinoma		Squamous cell carcinoma
	Number of cases	SIR (95% CI)	Number of cases	SIR (95% CI)
Overall	18	1.1 (0.6–1.7)	70	1.8 (1.4–2.3)
Follow‐up duration, years
2–10	12	1.1 (0.6–2.0)	48	1.8 (1.3–2.4)
11+	6	1.0 (0.4–2.2)	22	1.9 (1.2–2.9)
Sex
Men	15	1.1 (0.6–1.9)	53	2.0 (1.5–2.6)
Women	3	0.9 (0.2–2.7)	17	1.5 (0.8–2.3)
Complication†
Yes	11	1.1 (0.6–2.0)	39	1.7 (1.2–2.3)
No	7	1.1 (0.4–2.2)	31	2.1 (1.4–2.9)
Calendar year of index hospitalisation
1965–79	4	1.0 (0.3–2.4)	26	1.9 (1.2–2.8)
1980–2003	14	1.1 (0.6–1.9)	44	1.8 (1.3–2.4)
Age at entry
<50	2	1.2 (0.1–4.2)	10	3.2 (1.5–5.8)
50–69	10	1.2 (0.6–2.3)	43	2.2 (1.6–3.0)
70–	6	0.9 (0.3–1.9)	17	1.1 (0.6–1.7)
P for trend		0.49		<0.01
Calendar year of follow‐up
1965–94	5	0.8 (0.3–1.9)	38	1.6 (1.1–2.2)
1995–2003	13	1.3 (0.7–2.1)	32	2.2 (1.5–3.1)

*First year of follow‐up was excluded

†Including bleeding and perforation.