Table 6.

  Adjusted* hazard ratios for mortality according to BMI and smoking†

BMI and smoking	Hazard ratio (95% CI)	P value
Extreme underweight (BMI<17)
Non-smoker	1.24 (0.81 to 1.91)	0.32
Light smoker	1.80 (1.25 to 2.59)	0.002
Heavy smoker	3.09 (2.26 to 4.23)	<0.001
Moderate underweight (BMI 17-18.4)
Non-smoker	0.92 (0.72 to 1.17)	0.48
Light smoker	1.31 (1.06 to 1.61)	0.01
Heavy smoker	2.00 (1.64 to 2.44)	<0.001
Normal weight (BMI 18.5-24.9)
Non-smoker	1.00
Light smoker	1.56 (1.40 to 1.73)	<0.001
Heavy smoker	2.10 (1.89 to 2.33)	<0.001
Overweight (BMI 25-29.9)
Non-smoker	1.36 (1.05 to 1.77)	0.02
Light smoker	2.33 (1.81 to 3.00)	<0.001
Heavy smoker	2.55 (2.03 to 3.20)	<0.001
Obesity (BMI ≥30)
Non-smoker	2.14 (1.24 to 3.72)	0.01
Light smoker	2.88 (1.54 to 5.39)	0.00
Heavy smoker	4.74 (3.20 to 7.03)	<0.001

*Adjusted for muscle strength, socioeconomic status, and age.

†Light smoking 1-10 cigarettes/day, heavy smoking >10 cigarettes/day.