Table 3. Comparison in hospitalization rates between hemodialysis patients with and without influenza vaccination.

	Vaccine			Non-vaccine
Outcome	Event	PY	Rate#	Event	PY	Rate#	IRR*(95% CI)	Adjusted IRR(95% CI)	Adjusted HR (95% CI)
Total Hospitalization	459	462	99.4	1688	1888	89.4	1.11(0.96, 1.28)	0.80(0.69, 0.94)	0.82(0.73, 0.91)
Age, years
18–39	1	5	20	113	205	55.1	0.40(0.03, 5.54)	0.36(0.03, 4.76)	0.36(0.05, 2.62)
40–64	59	62	95.2	820	1118	73.3	1.31(0.92, 1.86)	1.22(0.86, 1.74)	1.16(0.89, 1.52)
65+	399	396	100.8	755	564	133.9	0.75(0.64, 0.89)	0.70(0.59, 0.82)	0.73(0.64, 0.82)

Rate^#, incidence rate, per 100 person-years; IRR^*, incidence rate ratio;

HR, hazard ratio adjusted for sex, age, coronary artery disease; congestive heart failure; chronic obstructive pulmonary disease, cancer, stroke, and calendar year