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Number of cases showing degenerative changes at last follow-up visits
| Group A | Group B | Total | p Value | |
|---|---|---|---|---|
| C2–3 | 1/18 (5%) | 0/69 (0%) | 1 | 0.21 |
| C3–4 | 2/20 (10%) | 3/49 (6%) | 5 | 0.62 |
| C4–5 | 11/45 (24%) | 0/22 (0%) | 11 | 0.01 |
| C5–6 | 11/42 (26%) | 2/18 (11%) | 13 | 0.38 |
| C6–7 | 3/27 (11%) | 5/38 (13%) | 8 | 0.8 |
| C7–T1 | 0/22 (0%) | 0/87 (0%) | 0 | |
| 28/174 (16%) | 10/283 (3%) | 38/457 (8%) | <0.01 |
