| GFR (mL/min/1.73m)2 | Sickle cell | Total | |
| Yes | No | ||
| Low | 9 (20%) | 18 (60%) | 27 (36%) |
| Normal | 19 (42.22%) | 9 (30%) | 28 (37.33%) |
| High | 17 (37.78%) | 3 (10%) | 20 (26.67%) |
| Total | 45 (100%) | 30 (100) | 75 (100%) |