| OHA | Major Agent | n | dose (mg) |
| Sulfonylurea | glimepiride/gliclazide | 94 | 0.7 (glimepiride) |
| α-Glucosidase inhibitor | miglitol/voglibose/acarbose | 235 | 164 (miglitol) |
| Biguanide | metformin | 78 | 618.6 (metformin) |
| Glinide | mitiglinide/nateglinide | 75 | 28.5 (mitiglinide) |
| Thiazolidinedione | pioglitazone | 69 | 20.2 (pioglitazone) |