Table 3. Cross tabulation of P2 and M1 developmental stages.
| P2 stage | M1 stage | ||||||
|---|---|---|---|---|---|---|---|
| C¾ | Crc | Ri | R¼ | R½ | R¾ | Total | |
| Ci | 4 | 53 | 17 | 14 | 1 | 0 | 89 |
| Cco | 3 | 19 | 18 | 19 | 4 | 0 | 63 |
| Coc | 2 | 7 | 9 | 16 | 2 | 0 | 36 |
| C½ | 1 | 0 | 0 | 4 | 0 | 3 | 8 |
| C¾ | 0 | 0 | 0 | 0 | 1 | 6 | 7 |
| Crc | 0 | 0 | 0 | 0 | 0 | 10 | 10 |
| Total | 10 | 79 | 44 | 53 | 8 | 19 | 213 |
Abbreviations: M1 (first molar); P2 (second premolar); Ci (initial mineralisation); Cco (coalescence of cusps); Coc (cusp outline complete); C½ (crown half); C¾ (crown three quarters); Crc (crown complete); Ri (initial root); R¼ (root quarter); R½ (root half); R¾ (root three quarters).