| P value | Time interval after surgery (month) | Average changes in height of ridge height with allograft (mm) |
| P < 0.05 | Immediately | 15.67 ± 2.08 |
| P < 0.05 | 3 | 21.33 ± 1.04 |
| P < 0.05 | 6 | 20.50 ± 0.5 |