Mean, median, and 10th percentile values for each measurement across the entire study population
| Measurement | N | Mean±SD (mm) | Median (mm) | 10th percentile (mm) |
| Diameter of IPS at JT | 72 | 3.31±0.98 | 3.42 | 1.82 |
| Diameter of IPS at IAC | 72 | 2.81±0.96 | 2.62 | 1.62 |
| Diameter of IPS at CN VI | 72 | 2.27±0.64 | 2.22 | 1.46 |
| Length of IPS from JB to JT | 72 | 13.8±1.95 | 14.2 | 11.0 |
| Length of IPS from JB to IAC | 72 | 19.4±2.79 | 19.33 | 16.6 |
| Length of IPS from JB to CN VI | 72 | 31.4±4.51 | 31.3 | 25.8 |
| Distance from IPS to BS at JT | 72 | 7.39±2.52 | 7.26 | 4.43 |
| Distance from IPS to BS at IAC | 72 | 4.38±1.89 | 4.31 | 1.76 |
| Distance from IPS to BS at CN VI | 72 | 3.86±1.68 | 3.53 | 1.64 |
| Shortest distance from IPS to VA | 50 | 3.52±2.92 | 2.72 | 0.9 |
| Shortest distance from IPS to BA | 70 | 8.75±3.49 | 8.54 | 4.2 |
BA, basilar artery; BS, brainstem; CN, cranial nerve; IAC, internal auditory canal; IPS, inferior petrosal sinus; JB, jugular bulb; JT, jugular tubercle; VA, vertebral artery.