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Association of facet tropism in cases (HNP) and control group at individual level (L3–L4, L4–L5, L5–S1)
| Level | HNP | Tropism | p value | ||
|---|---|---|---|---|---|
| Present | Absent | ||||
| L3–L4 | Yes | 0 | 0 | 0 | – |
| No | 4 | 0 | 4 | ||
| L4–L5 | Yes | 25 | 6 | 19 | 0.145 |
| No | 35 | 3 | 32 | ||
| L5–S1 | Yes | 35 | 13 | 22 | 0.0094 |
| No | 21 | 1 | 20 | ||
