STDCOEF to request standardized coefficients from PROC GLIMMIX

proc glimmix data=qc2 METHOD=RSPL;
class group_ID;
model Y = X
/dist=binomial link=logit s ddfm=kr STDCOEF;

It is not clear how coefficients are standardized.  Based on my investigation, centering is definitely done around the variable's grand mean; however, SD used for standardization is not 1.  When I simulated it, SD was around 0.036 (meaning I created a z-score using mean=0 and STD=0.036 to get the same coefficient off STDCOEF,

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