They were eligible when they had suboptimum glycaemic control ( HbA1c 7.1-11 .0 % [ 54-97 mmol/mol ] ) despite maximum tolerated doses of metformin alone or with a sulfonylurea for at least 3 months , a stable bodyweight for at least 3 months , and a BMI of 25-45 kg/m ( 2 ) ( 23-45 kg/m ( 2 ) in South Korea and Taiwan ) .