Table 2.

Conditional logistic regression between influenza vaccination and comorbidities and the risk of pneumonia.

Variable	Crude OR	95% CI	Adjusted OR †	95% CI
Vaccination
No	1		1
Yes	0.91	** 0.84–0.98	0.85	** 0.79–0.93
Hypertension	1.48	** 1.37–1.60	1.26	** 1.16–1.37
Diabetes	1.73	** 1.58–1.89	1.46	** 1.33–1.62
Cerebrovascular disease	2.48	** 2.24–2.76	2.15	** 1.92–2.41
Renal disease	2.06	** 1.78–2.38	1.64	** 1.41–1.92
Liver disease	1.31	** 1.12–1.54	1.11	0.94–1.32
Ischemic heart disease	1.40	** 1.28–1.53	1.35	** 1.22–1.49
Dementia	2.95	** 2.52–3.45	2.72	** 2.3–3.23
Alcohol-related disorder	4.07	** 2.27–7.31	3.68	** 1.99–6.82
Malignancy	2.88	** 2.54–3.27	3.10	** 2.71–3.55

^† Adjusted for hypertension, diabetes, cerebrovascular disease, renal disease, liver disease, ischemic heart disease, dementia, alcohol-related disorder, and malignancy. OR: odds ratio; CI: confidence interval; ** p < 0.01.