I am combining multiple studies on mortality in mental health. Some studies report standardized mortality ratio (SMR) and some report Hazard Ratios (HR or relative risk). Assuming both types of study measure mortality, can both be combined together? Is SMR effectively just HR but deaths vs general population expectations? Or is there some mathematical difference which means they cannot be pooled. Thank you.
I never combined SMR and Hazard ratios for mortality data. I guessed they can be combined by using certain programs.
I have pooled SMR and HR/RR after having seen that done previously in related literature. Here's the meta-analysis that I looked at:
RoereckeM, Rehm J. Alcohol use disorders and mortality: a systematic review and meta-analysis. Addiction. 2013;108(9):1562-1578
thank you thats v helpful I will have a look shortly at the methods in RoereckeM+Rehm J
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