Table 2. Mortality odds ratios (ORs), using normal weight as reference.

	30-day mortality, %	OR (95% CI)	OR (95% CI) Adjusted for age	OR (95% CI) Adjusted for age and smoking
BMI <18.5 kg/m2	7.5	2.81 (2.45–3.22)	2.17 (1.89–2.51)	2.37 (1.95–2.89)
BMI 18.5 to 25 kg/m2	2.8	Ref.	Ref.	Ref.
BMI 25 to 30 kg/m2	1.6	0.56 (0.51–0.63)	0.61 (0.55–0.68)	0.65 (0.56–0.76)
BMI 30 to 35 kg/m2	1.4	0.50 (0.43–0.58)	0.63 (0.54–0.74)	0.76 (0.61–0.94)
BMI 35 to 40 kg/m2	1.4	0.50 (0.38–0.65)	0.80 (0.61–1.05)	0.86 (0.59–1.26)
BMI > 40 kg/m2	1.7	0.58 (0.41–0.83)	1.12 (0.78–1.60)	1.08 (0.64–1.82)