In this double-blind phase @ trial , patients ( aged @ years ) with type @ diabetes and HbA@c concentrations of @-@ % , despite metformin treatment and diet and exercise counselling , were randomly assigned in a @:@ ratio with a computer-generated random sequence , stratified by HbA@c , estimated glomerular filtration rate ( eGFR ) , and region , to empagliflozin ( @ mg once daily , orally ) or glimepiride ( @-@ mg once daily , orally ) as add-on to metformin for @ weeks .