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Distribution of operation levels
| Disc level | Value |
|---|---|
| Two disc levels | 15 |
| L3–4–5 | 10 (66.7) |
| L4–5–S1 | 5 (33.3) |
| Three disc levels | 10 |
| L1–2–3–4 | 1 (10.0) |
| L2–3–4–5 | 2 (20.0) |
| L3–4–5–S1 | 7 (70.0) |
| Four disc levels | 5 |
| L2–3–4–5–S1 | 5 (100) |
Values are presented as number (%).
