Table 2.
Normal values for kidney length pole to pole, cortical and parenchymal width, classified according to the side of the kidney, and gender
| Mean | Median | 95% Confidence interval of mean | SD | 2% Percentile | 10% Percentile | 90% Percentile | 98% Percentile | Wilcoxon test | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (mm) | (mm) | Lower | Upper | (mm) | (mm) | (mm) | (mm) | (mm) | p value | ||
| Women | Kidney length right side | 103.8 | 104 | 102.8 | 104.9 | 11.1 | 79.6 | 90.31 | 117.9 | 128.0 | <0.0001 |
| Kidney length left side | 106.3 | 106 | 105.3 | 107.4 | 11.5 | 82.5 | 92.12 | 121.9 | 130.9 | ||
| Parenchymal width right | 14.5 | 14.4 | 14.3 | 14.7 | 2.6 | 8.9 | 14.26 | 14.74 | 20.4 | <0.0001 | |
| Parenchymal width left | 15 | 14.8 | 14.7 | 15.2 | 2.4 | 10.7 | 12.3 | 18.4 | 20.2 | ||
| Cortical width right side | 6.2 | 6.1 | 6.1 | 6.3 | 1.3 | 3.8 | 4.6 | 8.2 | 9.4 | ns | |
| Cortical width left side | 6.2 | 6.2 | 6.1 | 6.3 | 1.2 | 3.7 | 4.7 | 7.7 | 8.6 | ||
| Width right (axial planes) | 48 | 47.2 | 47.3 | 48.6 | 7.2 | 34.9 | 40.2 | 57.6 | 65.2 | <0.0001 | |
| Width left (axial planes) | 49.4 | 49.3 | 48.7 | 50.1 | 7.4 | 35.8 | 40.6 | 58.1 | 67.6 | ||
| Length right (axial planes) | 55.8 | 55.8 | 55 | 56.6 | 7.9 | 39.5 | 46.8 | 64.6 | 73.9 | <0.0001 | |
| Length left (axial planes) | 51.2 | 50.8 | 50.4 | 52.1 | 8.3 | 35.6 | 42 | 61.9 | 71.5 | ||
| Width of the pyelon (right side) | 16.9 | 16.1 | 16.4 | 17.4 | 5.7 | 7.5 | 10.3 | 11.5 | 31.3 | <0.0001 | |
| Width of the pyelon (left side) | 18.0 | 17.1 | 17.5 | 18.5 | 5.6 | 9.1 | 24.6 | 26.0 | 30.9 | ||
| Parenchym/pyelon ratio (right side) | 1.0 | 0.9 | 0.9 | 1.0 | 0.4 | 0.4 | 0.6 | 1.4 | 1.8 | = 0.0215 | |
| Parenchym/pyelon ratio (left side) | 0.9 | 0.9 | 0.9 | 1.0 | 0.6 | 0.4 | 0.5 | 1.3 | 1.8 | ||
| Men | Kidney length right side | 112.0 | 112.0 | 111.1 | 113.0 | 11.6 | 87.8 | 99.0 | 126.0 | 136.4 | <0.0001 |
| Kidney length left side | 114.9 | 115.0 | 113.9 | 115.9 | 12.0 | 88.0 | 100.0 | 130.0 | 140.0 | ||
| Parenchymal width right | 16.3 | 16.1 | 15.9 | 16.4 | 2.7 | 10.4 | 12.9 | 19.5 | 21.8 | = 0.0002 | |
| Parenchymal width left | 16.5 | 16.4 | 16.3 | 16.7 | 2.4 | 11.3 | 13.2 | 19.8 | 22.3 | ||
| Cortical width right side | 6.8 | 6.7 | 6.7 | 7.0 | 2.2 | 3.9 | 5.0 | 8.6 | 10.2 | = 0.0470 | |
| Cortical width left side | 7.0 | 6.9 | 6.8 | 7.2 | 2.7 | 4.3 | 5.0 | 8.8 | 10.1 | ||
| Width right (axial planes) | 53.9 | 53.4 | 53.3 | 54.5 | 7.2 | 39.7 | 45.4 | 63.0 | 70.2 | <0.0001 | |
| Width left (axial planes) | 56.4 | 56.3 | 55.8 | 57.4 | 7.5 | 42.1 | 47.4 | 65.6 | 73.1 | ||
| Length right (axial planes) | 59.3 | 58.9 | 58.5 | 60.0 | 7.9 | 44.5 | 50.0 | 69.0 | 78.0 | <0.0001 | |
| Length left (axial planes) | 55.5 | 54.5 | 54.8 | 56.3 | 8.0 | 39.6 | 45.9 | 66.5 | 74.4 | ||
| Width of the pyelon (right side) | 19.7 | 18.7 | 19.1 | 20.2 | 19.7 | 8.3 | 12.5 | 28.0 | 35.06 | <0.0001 | |
| Width of the pyelon (left side) | 21.5 | 20.7 | 20.9 | 22.0 | 21.5 | 9.6 | 13.8 | 30.7 | 35.1 | ||
| Parenchym/pyelon ratio (right side) | 0.9 | 0.8 | 0.9 | 1.0 | 0.5 | 0.4 | 0.5 | 1.4 | 2.0 | <0.0001 | |
| Parenchym/pyelon ratio (left side) | 0.9 | 0.8 | 0.8 | 0.9 | 0.4 | 0.4 | 0.5 | 1.3 | 1.8 | ||