Income inequality, mortality, and self rated health: meta-analysis of multilevel studiesBMJ 2010; 341 doi: http://dx.doi.org/10.1136/bmj.c5590 (Published 12 October 2010) Cite this as: BMJ 2010;341:c5590
In this research article by Naoki Kondo and colleagues (BMJ 2009;339:b4471, doi:10.1136/bmj.b4471), the sample size of data used by Kravdal (2008) in the third row in table 1 (about the characteristics of selected cohort studies) actually represents person years. Although Kravdal does not report the exact sample size, the study followed up on the entire Norwegian population aged between 30 and 79, which was about 2.5 million during that study period of 1980-2002, according to Statistics Norway. Therefore, the correct total sample size of our meta-analysis of cohort studies should be about 7.7 million. This affects the opening sentence of the Results section of the Abstract; the third row in table 1 (“census 1980-2002 (n=54.31 million)”); and the first paragraph of the Results section. The authors state that this correction does not change any estimates reported in their paper and its conclusion.
Cite this as: BMJ 2010;341:c5590