I have been asked by someone to perform statistical analysis for a meta-analysis.

The aim of the study is to compare between different surgical approaches.

The data I got from this person are only summary data from past medical research results,

for example:

*(1) in study No.1, using approach X, there were 400 successes and 50 failures,*

*using approach Y - there were 300 successes and 60 failures.*

*(2) in study No.2,, using approach X, there were 300 successes and 40 failures,*

*using approach Y - there were 200 successes and 60 failures.*

**My question: Could anyone tell me how do I perform the analysis ? Can I use Chi-square ?**

Thank you very much in advance.

Jack