An error in this online paper by Diana Rucker and colleagues persisted through the editing and proofing process (BMJ 2007, 15 Nov, doi: 10.1136/bmj.39385.413113.25). The penultimate sentence of the results section in the abstract should read: “Sibutramine improved [not “lowered”] concentrations of high density lipoprotein cholesterol and triglycerides.”