Table 2. Standardised incidence ratios (SIR) and 95% confidence intervals (CI) for cancers at selected sites, stratified by sex,a among users of low-dose aspirin in North Jutland county, Denmark, 1989–1997.

	Men			Women			Total
Site of cancer (modified ICD-7 code)	Obsb	SIR	95% CI	Obsb	SIR	95% CI	Obsb	SIR	95% CI
All malignant neoplasms (140–205)	1362	1.10	1.04–1.16	1019	1.08	1.01–1.14	2381	1.09	1.05–1.13
Buccal cavity and Pharynx (140–148)	32	1.2	0.8–1.7	16	1.5	0.9–2.4	48	1.3	0.9–1.7
Digestive system (150–159)	303	1.0	0.9–1.1	247	1.0	0.9–1.2	550	1.0	0.9–1.1
Oesophagus (150)	17	1.3	0.7–2.0	9	1.5	0.7–2.8	26	1.3	0.9–1.9
Stomach (151)	50	1.1	0.8–1.5	18	0.9	0.5–1.3	68	1.1	0.8–1.3
Colon (153)	108	1.1	0.9–1.3	87	0.9	0.7–1.1	195	0.9	0.7–1.1
Rectum (154)	67	1.0	0.8–1.3	37	0.9	0.6–1.3	104	1.0	0.8–1.2
Liver (155)	16	1.1	0.6–1.7	5	0.7	0.2–1.7	21	1.0	0.6–1.5
Pancreas (157)	27	0.9	0.6–1.4	35	1.2	0.8–1.6	62	1.1	0.8–1.3
Larynx (161)	16	1.4	0.8–2.3	4	2.7	0.7–6.8	20	1.5	0.9–2.4
Lung (162)	173	1.0	0.8–1.1	101	1.3	1.0–1.5	274	1.1	0.9–1.2
Breast (170)	1	0.6	0.0–3.2	148	0.9	0.8–1.1	149	0.9	0.8–1.1
Female genital organs (171–176)	—	—	—	108	1.1	0.9–1.3	108	1.1	0.9–1.3
Cervix uteri	—	—	—	15	0.9	0.5–1.6	15	0.9	0.5–1.6
Corpus uteri	—	—	—	45	1.1	0.8–1.5	45	1.1	0.8–1.5
Ovary	—	—	—	34	1.1	0.7–1.5	34	1.1	0.7–1.5
Prostate (177)	196	1.1	1.0–1.3	—	—	—	196	1.1	1.0–1.3
Kidney (180)	45	1.6	1.1–2.1	22	1.1	0.7–1.6	67	1.4	1.1–1.7
Urinary bladder (181)	134	1.2	1.0–1.5	27	0.9	0.6–1.4	161	1.2	1.0–1.4
Melanoma (190)	31	1.3	0.9–1.8	21	1.1	0.7–1.7	52	1.2	0.9–1.6
Nonmelanoma skin cancer (191)	246	1.1	0.9–1.2	161	1.0	0.9–1.2	407	1.1	0.9–1.2
Brain (193)	33	1.5	1.0–2.1	37	1.9	1.4–2.7	70	1.7	1.3–2.2
Non-Hodgkin's lymphoma (200, 202)	37	1.4	1.0–1.9	20	0.9	0.5–1.4	57	1.1	0.9–1.5
Leukaemia (204)	44	1.2	0.9–1.7	25	1.4	0.9–2.0	69	1.3	1.0–1.6

^aPerson-years of observation in each stratum: men, 61 093; women, 60 469.

^bObserved number of cases.