In the study, prediabetes was classed as an FG level of 110-125 mg/dL (6.1-6.9 mmol/l) and/or an HbA1c level of 6-6.4%, as defined by the International Expert Committee of 2009, or as an FG of 100-125 mg/dL (5.6-6.9 mmol/l) and/or an HbA1c of 5.7-6.4%, as defined by the American Diabetes Association.