Association of body-mass index with all-cause mortality, by baseline age group
The HR per 5 kg/m2 higher body-mass index (BMI) and its 95% CI are calculated only for BMI more than 25·0 kg/m2. Analyses restricted to never-smokers without pre-existing chronic disease, and excluding the first 5 years of follow-up, and include data from all geographical regions. The reference category is shown with the arrow and is 22·5–<25·0 kg/m2. CIs are from floating variance estimates (reflecting independent variability within each category, including the reference category). Areas of squares are proportional to the information content. Analyses by baseline age and the three main geographical regions are in the appendix (p 38). HR=hazard ratio.