We read with interest the article by Landi et al1 that investigated the relationship between body mass index ([BMI] calculated as the weight in kilograms divided by the square of the height in meters) and mortality among hospitalized patients. In this article, the relationship between BMI and mortality in younger patients was hyperbolic, with increased death rates at the lowest and highest BMI values. Older subjects, on the other hand, had an increased death rate at the lowest BMI values with only a slight elevation at the highest BMI values. All subjects who were 65 years or older were grouped in 1 category in this study.
Kamel HK, Iqbal MA. Body Mass Index and Mortality Among Hospitalized Elderly Patients. Arch Intern Med. 2001;161(11):1459. doi: