Revman 5-Generic inverse variance method

Meta-analysis of hazard ratio (HR) is available on Revman 5 by using generic inverse variance method.
However, if some of the studies presented HR using treatment A as reference while some using treatment B as reference, then how could I deal with it ?
HR could be theoretically inverted to change the different reference group, but what about the 95% confidence interval ?


Not a robit
Not overly familiar with Revman, but yes the 95% CI values are also invariable, meaning you can also use their inverse. Whenever I have a question like this, to confirm the validity, I will just run a model both ways using an available dataset to show that it works - for reassurance purposes.