Table 3. Lumbar levels treated.

Surgical Levels	Value
1 level (n=18) (%)
L3–4	8 [44]
L4–5	8 [44]
L5–S1	2 [11]
2 level (n=7) (%)
L2–4	1 [14]
L3–5	1 [4]
L4–S1	5 [71]