Table 4.
Relative risks of premature death estimated by Cox regression analysis* (with 95% confidence intervals) according to categories of BMI† and smoking
| BMI | Total (n=45 884) | Smoking status | |||||
|---|---|---|---|---|---|---|---|
| Base model | Adjusted also for smoking | Non-smokers (n=18 990) | Smokers (n=26 894) | Light (1-10/day) (n=14 846) | Heavy (>10/day) (n=12 048) | ||
| Underweight | 1.00 (0.89 to 1.12), P=0.99 | 0.97 (0.86 to 1.08), P=0.56 | 0.94 (0.75 to 1.18), P=0.62 | 0.97 (0.85 to 1.11), P=0.69 | 0.91 (0.75 to 1.10), P=0.32 | 1.05 (0.88 to 1.25), P=0.61 | |
| Normal weight | 1 | 1 | 1 | 1 | 1 | 1 | |
| Overweight | 1.34 (1.16 to 1.55), P<0.001 | 1.33 (1.15 to 1.53), P<0.001 | 1.37 (1.05 to 1.79), P=0.02 | 1.35 (1.14 to 1.60), P<0.001 | 1.44, (1.11 to 1.86), P=0.006 | 1.23 (0.98 to 1.54), P=0.08 | |
| Obesity | 2.22 (1.66 to 2.95), P<0.001 | 2.14 (1.61 to 2.85), P<0.001 | 2.16 (1.24 to 3.76), P=0.007 | 2.23 (1.60 to 3.12), P<0.001 | 1.83 (0.98 to 3.42), P=0.06 | 2.27 (1.53 to 3.38), P<0.001 | |
*All models adjusted for muscular strength, socioeconomic status, and age.
†Body mass index (kg/m2): underweight <18.5, normal weight 18.5-24.9, overweight 25-29.9, obese ≥30.