Demographic data and distribution of the foraminal stenosis cases.
| Foraminal Stenosis Type | Patients, n | Mean Age, y | Gender | |
| Women | Men | |||
| Stable type I | 12 | 66.2 | 8 | 4 |
| Stable type II | 10 | 53.9 | 7 | 3 |
| Stable type III | 8 | 69.4 | 4 | 4 |
| Stable type IV | 6 | 37.0 | 2 | 4 |
| Unstable type I | 45 | 51.7 | 18 | 27 |
| Unstable type II | 15 | 61.4 | 9 | 6 |
| Unstable type III | 9 | 55.8 | 6 | 3 |
| Unstable type IV | 10 | 59.4 | 5 | 5 |
| Total | 115 | 56.1 | 59 | 56 |