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Classification of internal groove parameters based on the number of findings
| Type | Number of internal groove findings | n (%) |
|---|---|---|
| Type 0 | None | 0 (0%) |
| Type I | One | 11 (15.7) |
| Type II | Two* | 18 (25.7) |
| Type III | Three* | 30 (42.9) |
| Type IV | Four or more* | 11 (15.7) |
* Any combination
