| IIDM | Insulin independent diabetes mellitus |
| MeSH | Medical subject heading |
| Mg | Magnesium |
| NIDDM | Non-insulin dependent diabetes mellitus |
| NOS | Newcastle–Ottawa scale |
| NPDR | Non-proliferative diabetic retinopathy |
| PDR | Proliferative diabetic retinopathy |
| PICOS | Population Intervention Comparison Outcome and Study design |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| SD | Standard deviation |
| SMD | Standardized mean difference |
| T2DM | Type 2 diabetes mellitus |
| WHO | The World Health Organization |