Table 4 Adjusted relative risks associated with influenza and pneumonia vaccination for all-cause mortality rates and death associated with a respiratory event in patients with chronic obstructive pulmonary disease aged at least 40 years

	Vaccinated against influenza	December to March		April to November
		Vaccinated against pneumonia		Vaccinated against pneumonia
		No	Yes	No	Yes
Deaths	No	1	1.68 (1.58 to 1.78)	1	1.28 (1.20 to 1.36)
Deaths	Yes	0.59 (0.57 to 0.61)	0.53 (0.51 to 0.56)	0.98 (0.95 to 1.01)	0.88 (0.85 to 0.91)
Deaths associated with a respiratory event	No	1	1.78 (1.55 to 2.04)	1	1.45 (1.25 to 1.79)
Deaths associated with a respiratory event	Yes	0.63 (0.58 to 0.68)	0.61 (0.56 to 0.67)	1.03 (0.96 to 1.11)	1.03 (0.96 to 1.12)
Deaths with a respiratory event recorded as cause of death	No	1	2.29 (1.80 to 2.91)	1	1.93 (1.52 to 2.46)
Deaths with a respiratory event recorded as cause of death	Yes	0.63 (0.55 to 0.77)	0.87 (0.74 to 1.03)	1.00 (0.85 to 1.19)	1.26 (1.09 to 1.46)