Calculating effect sizes after MI and mixed

Hello All,

I hope this message finds you well!

After running the following code is there a way to calculate effect sizes?

Code:

mi estimate : mixed dnT1_sum SR_Fall age_month edu mvpa_all light_sed MVPA_FallSR  c_sex1 || classid:

I came across the following Stata blog but the recommendations are not feasible with my above analysis. I received the following error after trying "estat esize"

Code:

. estat esize
estat esize not valid
r(321);

Thank you for your time and help,
Patrick