Patients with hemoglobin A1c ( HbA1c ) of 6.9-10 .5 % on diet therapy were randomized in a double-blind manner to treatment with 1 , 2.5 , 5 , or 10mg luseogliflozin or placebo for 12 weeks ( n = 56 , 56 , 54 , 58 , and 58 , respectively ) .