Endgames: Statistical questionBMJ 2010; 341 doi: http://dx.doi.org/10.1136/bmj.c7133 (Published 10 December 2010) Cite this as: BMJ 2010;341:c7133
In this question about z scores, the numbers of patients given in the example study were incorrect (BMJ 2010;341:c6746, doi:10.1136/bmj.c6746). In the first paragraph, the second sentence should start: “A total of 644 children [not “511 children”] aged between 7 and 11 years . . .” Also, not all of these children were followed up at three years; the z scores for body mass index were calculated only for the 434 children who were.
Cite this as: BMJ 2010;341:c7133