The Transformation of the Main Indices for the Meta-analysis of Survival Data

Meta-analysis of survival data is becoming more and more. However, most of the original literature did not offer the comprehensive porting: logrank observed events （O）, logrank expected events （E）, hazard ratio （HR） and logrank variance （V）. This paper summarized a variety of methods about how to transform O-E, HR and V. We hope that the researcher can use the methods freely, and use HR in the meta-analysis of survival data.