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| Age (yr) | Root | Root segment | ||
|---|---|---|---|---|
| Cervical | Middle | Apical | ||
| 20–39 | Mesial | 4.98 ± 1.70 | 3.72 ± 1.71 | 5.30 ± 2.49 |
| Distal | 4.25 ± 1.55 | 3.05 ± 1.92 | 4.41 ± 2.22 | |
| 40–60 | Mesial | 4.92 ± 1.93 | 3.92 ± 1.92 | 5.41 ± 2.41 |
| Distal | 4.48 ± 1.60 | 3.11 ± 1.70 | 4.68 ± 2.26 | |
Data are presented as mean ± standard deviation.
