I am not sure (??). Maybe @SAS_Rob can help here? See:
Paper SAS1991-2018 Causal Mediation Analysis with the CAUSALMED Procedure Yiu-Fai Yung, Michael Lamm, and Wei Zhang, SAS Institute Inc. https://support.sas.com/resources/papers/proceedings18/1991-2018.pdf
Also have a look into PROC PSMATCH.
Koen
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