Table 3

Incidence densities of dementia HRs between the vagotomy and non-vagotomy cohorts based on demographic characteristics and comorbidities

	Vagotomy						HR (95% CI)
	No			Yes
	Event	PY	Rate†	Event	PY	Rate†
Sex
Women	77	21 364	3.60	66	18 104	3.65	1.56 (1.00 to 2.44)*
Men	221	83 568	2.64	162	75 603	2.14	0.96 (0.74 to 1.24)
Stratify age
≤64	24	73 656	0.33	35	69 339	0.50	2.07 (1.12 to 3.83)*
≥65	274	31 275	8.76	193	24 367	7.92	0.97 (0.76 to 1.24)
Comorbidity‡
No	1	2156	0.46	1	1493	0.67	–
Yes	297	102 776	2.89	227	92 214	2.46	1.08 (0.86 to 1.35)
Follow-up period
<4	131	43 502	3.01	116	38 634	3.00	1.24 (0.94 to 1.63)
4–7	119	34 038	3.50	87	30 274	2.87	0.91 (0.59 to 1.40)
≥7	48	19 534	2.46	25	17 780	1.41	0.50 (0.17 to 1.46)

*P<0.05.
†Incidence rate per 1000 person-years.
‡Comorbidity: patients with any one of the listed comorbidities were classified as the comorbidity group.
PY, person-years.