To the Editor In a recent issue of the Journal, Orlich et al1 described in an observational cohort study a relation between dietary patterns and all-cause mortality. Compared with nonvegetarians, vegans had a hazard ratio of 0.85 (95% CI, 0.73-1.01) for all-cause mortality. The regression models were adjusted for known covariates, such as age, smoking, physical activity, alcohol consumption, and socioeconomic status.
Mullie P, Autier P. Lack of Adjustment for Body Mass Index. JAMA Intern Med. 2014;174(1):168-169. doi:10.1001/jamainternmed.2013.11171