This article "How confidence intervals become confusion intervals," on the BMC Medical Research Methodology website: http://www.biomedcentral.com/1471-2288/13/134(Links to an external site.) is a A meta-analysis is a research paper that analyzes the results of all the research studies pertaining to a particular topic.

"What is the mean value of the relative risk of overall mortality with statin use in primary prevention for each of the five meta-analyses?"