Standardized effect size (you can also use this for baseline equivalence test).
This looks like a test of two means, but you can also use it to test binary variables (you will need to fill in an SD value with any number).
Two versions, but the same results.
Algorithms for Standardized Group Difference
0.00 <= baseline ES <= 0.05 Satisfies BE
0.05 < baseline ES <= 0.25 with covariates baseline ES > 0.25 Fails
Attrition (Page 10 of https://ies.ed.gov/ncee/wwc/Docs/referenceresources/WWC-Standards-Handbook-v4-1-508.pdf )