sysuse cancer stset studytime, failure(died) xi: stcox age i.drug, nolog lab var _Idrug_2 "Tadalafil" lab var _Idrug_3 "Sildenafil" esttab, eform wide label nostar refcat(_Idrug_2 "Placebo") esttab, eform wide label nostar refcat(_Idrug_2 "Placebo", label(1))