HRs for the risk of mortality in subgroups
| Subgroups | BMI category | HR (95% CI) | P-value for interaction |
| Sex | |||
| Male | Underweight | 2.074 (1.272 to 3.383) | 0.68 |
| Overweight | 0.873 (0.756 to 1.008) | ||
| Obese | 0.890 (0.730 to 1.084) | ||
| Female | Underweight | 1.394 (0.917 to 2.119) | |
| Overweight | 0.866 (0.721 to 1.039) | ||
| Obese | 0.864 (0.691 to 1.082) | ||
| Age | |||
| >65 | Underweight | 1.595 (1.140 to 2.230) | 0.38 |
| Overweight | 0.896 (0.794 to 1.011) | ||
| Obese | 0.911 (0.771 to 1.076) | ||
| ≤65 | Underweight | 1.964 (0.714 to 5.406) | |
| Overweight | 0.687 (0.495 to 0.952) | ||
| Obese | 0.709 (0.492 to 1.023) | ||
| Diabetes mellitus | |||
| Diabetic | Underweight | 2.591 (1.051 to 6.385) | 0.62 |
| Overweight | 0.937 (0.736 to 1.194) | ||
| Obese | 0.877 (0.674 to 1.143) | ||
| Non-diabetic | Underweight | 1.535 (1.092 to 2.157) | |
| Overweight | 0.851 (0.748 to 0.968) | ||
| Obese | 0.898 (0.745 to 1.082) | ||
| Smoking | |||
| Current smoker | Underweight | 1.766 (1.017 to 3.066) | 0.67 |
| Overweight | 0.782 (0.611 to 1.001) | ||
| Obese | 0.917 (0.674 to 1.249) | ||
| Non-smoker | Underweight | 1.550 (1.049 to 2.291) | |
| Overweight | 0.893 (0.786 to 1.015) | ||
| Obese | 0.871 (0.733 to 1.034) | ||
There were no significant interactions between dichotomous subgroups and BMI categories with respect to 1-year mortality.
BMI, body mass index.