Mathematic Parameters of Old (MIRD19) and New Kidney Models and Reference Spheres
| Model | Parameter | Newborn | 1-y-old | 5-y-old | Adult |
| Kidney | aold (mm) | 17.9 | 26.1 | 32.0 | 45.0 |
| bold = bnew (mm) | 9.3 | 12.5 | 14.0 | 15.0 | |
| cold (mm) | 17.0 | 24.1 | 32.0 | 55.0 | |
| anew = cnew (mm) | 17.5 | 25.1 | 32.0 | 50.0 | |
| dpelvis (mm) | 12.0 | 16.9 | 21.3 | 30.0 | |
| VK (cm3) | 8.59 | 24.15 | 44.36 | 122.93 | |
| Reference sphere | rS (mm) | 12.7 | 17.9 | 22.0 | 30.8 |
| VS (cm3) | 8.58 | 24.23 | 44.30 | 122.99 |