Table 2– Hospitalisation rates for pneumonia among males according to alcohol intake, Denmark 1993–2008

	Drinks·week⁻¹
	0	1–6	7–20	21–34	35–50	>50
Males n	338	5346	9637	4469	1894	801
Pneumonia diagnosis n	26	272	406	193	114	80
Incidence rate per 1000 person-yrs	7.02	4.45	3.67	3.79	5.34	9.16
Crude HR (95% CI)^#	1.61 (1.08–2.39) p=0.02	1.0 (ref.)	0.86 (0.74–1.00) p=0.05	0.89 (0.74–1.07) p=0.22	1.30 (1.05–1.62) p=0.02	2.28 (1.77–2.93) p<0.001
Adjusted HR (95% CI)^¶	1.49 (1.00–2.21) p=0.05	1.0 (ref.)	0.88 (0.76–1.03) p=0.11	0.87 (0.72–1.05) p=0.14	1.15 (0.93–1.44) p=0.20	1.81 (1.40–2.33) p<0.001
Adjusted HR (95% CI)⁺	1.40 (0.93–2.12) p=0.11	1.0 (ref.)	0.94 (0.80–1.10) p=0.42	0.90 (0.75–1.09) p=0.30	1.14 (0.91–1.43) p=0.24	1.45 (1.11–1.90) p=0.01

HR: hazard ratio; CI: confidence interval; ref.: reference. ^#: calculated using Cox's regression, with age as the underlying time variable; ^¶: based on the crude model with additional adjustment for smoking status and body mass index; ⁺: based on the crude model with additional adjustment for smoking status, body mass index and major chronic diseases.