Hello， in my code below, I assign (diabetes=1 and type=2) as diagnosis=2, which represents Type 2 diabetes, and use proc surveylogistic  statement to investigate the relationship between the Type 2 diabetes and gender.    Then, I assign(diabetes=1 and type=2) as diagnosis=1 (so diagnosis =1 represent type 2 diabetes now), and use the same proc surveylogistic statement to investigate the relationship.    The inferential analysis results are different, which indicate that it matters whether diagnosis=1 or diagnosis =2 represents type 2 diabetes. So I want to ask should I use diagnosis=1 or diagnosis =2 represent type 2 diabetes. Which one would SAS consider as default control group?   Thank you! DATA nh.A; SET nh.A; IF (diabetes=1 and type=2) then diagnosis=2; **** have T2D diabetes; else diagnosis=1; run; *** variable diagnosis specified type of diabetes T2D; *** SLR; proc surveylogistic data=nh.A nomcar; class gender / param=glm;     strata SDMVSTRA;     cluster SDMVPSU;     weight glucwt4yr; domain eligible; model diagnosis=gender/ vadjust=none link=glogit; lsmeans gender / cl oddsratio adjust =tukey; run;     ... View more