Table 2. Cross tabulation of P2 and P1 developmental stages.
| P2 stage | P1 stage | |||||||
|---|---|---|---|---|---|---|---|---|
| Cco | Coc | C½ | C¾ | Crc | Ri | R¼ | Total | |
| Ci | 21 | 35 | 23 | 9 | 1 | 0 | 0 | 89 |
| Cco | 0 | 12 | 22 | 28 | 1 | 0 | 0 | 63 |
| Coc | 1 | 1 | 12 | 20 | 2 | 0 | 0 | 36 |
| C½ | 0 | 0 | 0 | 4 | 3 | 1 | 0 | 8 |
| C¾ | 0 | 0 | 0 | 0 | 3 | 4 | 0 | 7 |
| Crc | 0 | 0 | 0 | 0 | 0 | 8 | 2 | 10 |
| Total | 22 | 48 | 57 | 61 | 10 | 13 | 2 | 213 |
Abbreviations: P1 (first premolar); 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).