Table 3. Multivariable^a hazard ratios for mortality from infectious disease according to body mass index, stratified by smoking status, age, and exclusion of early death.

Body mass index, kg/m2	<20.0 kg/m2	20.0–22.9 kg/m2 (reference)	23.0–24.9 kg/m2	≥25.0 kg/m2
Never smoker
Person-years at risk	2838	8744	5711	7215
Infectious disease, number of deaths	10	19	12	10
Multivariable HR (95% CI)	1.60 (0.70–3.66)	1.00	0.96 (0.45–2.04)	0.63 (0.28–1.41)
Current smoker
Person-years at risk	2407	6255	3924	3558
Infectious disease, number of deaths	11	24	4	6
Multivariable HR (95% CI)	1.92 (0.87–4.23)	1.00	0.34 (0.11–1.02)	0.53 (0.20–1.37)
<65 years old
Person-years at risk	4441	14 475	9253	10 236
Infectious disease, number of deaths	10	32	7	9
Multivariable HR (95% CI)	1.19 (0.57–2.48)	1.00	0.34 (0.15–0.79)	0.38 (0.18–0.81)
≥65 years old
Person-years at risk	2679	5912	3649	4064
Infectious disease, number of deaths	20	38	15	17
Multivariable HR (95% CI)	1.25 (0.71–2.20)	1.00	0.55 (0.30–1.03)	0.54 (0.30–0.98)
Exclusion of those who died within 5 years
Person-years at risk	6915	20 147	12 761	14 154
Infectious disease, number of deaths	23	63	17	24
Multivariable HR (95% CI)	1.02 (0.63–1.67)	1.00	0.42 (0.25–0.73)	0.51 (0.32–0.83)

CI, confidence interval; HR, hazard ratio.

^aAdjusted for age, sex, history of hypertension, drug treatment for diabetes, family history of diabetes, alcohol intake, smoking status, perceived mental stress, walking, sports, sleep duration, and energy intake except for each stratified variable.