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| Hemoglobin level, mg/dL | Diabetic retinopathy grading in overall patients | p-value | |||
| Mild | Moderate | Severe | Proliferative | ||
| Normal | 41 (18.4) | 71 (31.8) | 32 (14.3) | 79 (35.4) | 0.568 |
| Mild anemia | 13 (14.3) | 23 (25.3) | 13 (14.3) | 42 (46.2) | |
| Moderate anemia | 8 (15.1) | 17 (32.1) | 4 (7.5) | 24 (45.3) | |
| Severe anemia | 0 (0) | 0 (0) | 0 (0) | 1 (100) | |
