Correlation between B12 and various parameters
| Parameters | Correlation | P value |
| Age | 0.172 | <0.0001 |
| BMI | −0.089 | 0.013 |
| Duration of DM | 0.017 | 0.706 |
| Duration of metformin | −0.236 | <0.0001 |
| Daily dose of metformin | −0.21 | <0.0001 |
| VPT | 0.262 | <0.0001 |
| DNS score | 0.128 | <0.0001 |
| DN4 score | 0.318 | <0.0001 |
| HbA1c | −0.09 | 0.378 |
| Homocysteine | −0.147 | 0.038 |
P<0.05 considered to be statistically significant.
BMI, body mass index; DM, diabetes mellitus; DN4, Douleur Neuropathique 4; DNS, Diabetic Neuropathy Symptom; VPT, vibration perception threshold.