Childhood intelligence and being a vegetarian

In this editorial by Marcus Richards the benefit of a vegetarian diet was inflated owing to an error in the reporting of a study (BMJ 2007;334:216-7, doi: 10.1136/bmj.39107.671412.80). In the second paragraph, Key et al, in their collaborative analysis (reference 5), found 24% (not 76%) lower mortality in vegetarians, and this reduction related to mortality from ischaemic heart disease, not overall mortality. The death rate ratio was 0.76 (95% confidence 0.62 to 0.94).