Nateglinide efficacy was inferior to that of metformin in monotherapy (decrease in HbA1c (%) with metformin 500 mg three times daily monotherapy: – 1.23 [95% CI: – 1.48; – 0.99] and with nateglinide 120 mg three times daily monotherapy – 0.90 [95% CI: – 1.14; – 0.66]).