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The degrees of facet degeneration according to ages
| 30–39 | 40–49 | 50–59 | 60–69 | Total | |
|---|---|---|---|---|---|
| Normal (%) | 149 (87.65) | 432 (88.16) | 200 (71.43) | 42 (70) | 823 (82.3) |
| Degenerated (%) | 21 (12.35) | 58 (11.84) | 80 (28.57) | 18 (30) | 177 (17.7) |
| Total (%) | 170 (100) | 490 (100) | 280 (100) | 60 (100) | 1000 (100) |
