Table 5. Means and standard deviations of measured parameters by retromolar pad shape.
| Variables | Shape | n | Mean | SDa | SEb | 95% CIc | Minimum | Maximum | |
|---|---|---|---|---|---|---|---|---|---|
| Lower limit | Upper limit | ||||||||
| Transverse diameter (mm) | oval/round | 111 | 5.6841 | 0.95962 | 0.09108 | 5.5036 | 5.8646 | 3.86 | 8.12 |
| pear | 226 | 5.8431 | 0.81801 | 0.05441 | 5.7358 | 5.9503 | 4.06 | 8.25 | |
| triangular | 63 | 6.7137 | 1.16349 | 0.14659 | 6.4206 | 7.0067 | 4.63 | 9.69 | |
| sum | 400 | 5.9361 | 0.97958 | 0.04898 | 5.8398 | 6.0324 | 3.86 | 9.69 | |
| Longitudinal diameter (mm) | oval/round | 111 | 8.3427 | 1.42533 | 0.13529 | 8.0746 | 8.6108 | 5.38 | 12.9 |
| pear | 226 | 8.4541 | 1.21616 | 0.08090 | 8.2947 | 8.6135 | 5.33 | 11.9 | |
| triangular | 63 | 8.6454 | 1.21378 | 0.15292 | 8.3397 | 8.9511 | 6.17 | 11.1 | |
| sum | 400 | 8.4533 | 1.27761 | 0.06388 | 8.3277 | 8.5789 | 5.33 | 12.9 | |
| Transverse-contour length (mm) | oval/round | 111 | 6.6084 | 1.30375 | 0.12375 | 6.3631 | 6.8536 | 4.28 | 11.9 |
| pear | 226 | 6.5748 | 0.93315 | 0.06207 | 6.4525 | 6.6971 | 4.43 | 9.18 | |
| triangular | 63 | 7.4062 | 1.44086 | 0.18153 | 7.0433 | 7.7691 | 5.05 | 12.4 | |
| sum | 400 | 6.7151 | 1.17131 | 0.05857 | 6.5999 | 6.8302 | 4.28 | 12.4 | |
| Longitudinal-contour length (mm) | oval/round | 111 | 8.4939 | 1.45909 | 0.13849 | 8.2194 | 8.7683 | 5.40 | 12.9 |
| pear | 226 | 8.5731 | 1.23591 | 0.08221 | 8.4110 | 8.7351 | 5.36 | 12.1 | |
| triangular | 63 | 8.7537 | 1.24006 | 0.15623 | 8.4413 | 9.0660 | 6.24 | 11.3 | |
| sum | 400 | 8.5795 | 1.30157 | 0.06508 | 8.4516 | 8.7075 | 5.36 | 12.9 | |
| Diameter ratiod | oval/round | 111 | 1.4914 | 0.26057 | 0.02473 | 1.4424 | 1.5405 | 0.99 | 2.14 |
| pear | 226 | 1.4579 | 0.18450 | 0.01227 | 1.4337 | 1.4821 | 1.03 | 2.01 | |
| triangular | 63 | 1.3030 | 0.15818 | 0.01993 | 1.2632 | 1.3429 | 1.06 | 1.80 | |
| sum | 400 | 1.4428 | 0.21371 | 0.01069 | 1.4218 | 1.4638 | 0.99 | 2.14 | |
| Contour length ratioe | oval/round | 111 | 1.3081 | 0.21720 | 0.02062 | 1.2673 | 1.3490 | 0.92 | 1.92 |
| pear | 226 | 1.3148 | 0.17131 | 0.01140 | 1.2924 | 1.3373 | 0.90 | 1.85 | |
| triangular | 63 | 1.2025 | 0.16744 | 0.02110 | 1.1604 | 1.2447 | 0.88 | 1.72 | |
| sum | 400 | 1.2953 | 0.18850 | 0.00943 | 1.2767 | 1.3138 | 0.88 | 1.92 | |
| Anglef (°) | oval/round | 111 | 43.268 | 10.4819 | 0.99490 | 41.296 | 45.239 | 17.8 | 70.1 |
| pear | 226 | 43.889 | 9.06588 | 0.60305 | 42.701 | 45.078 | 23.0 | 69.3 | |
| triangular | 63 | 44.487 | 9.84031 | 1.23976 | 42.009 | 46.966 | 22.5 | 70.3 | |
| sum | 400 | 43.811 | 9.58344 | 0.47917 | 42.869 | 44.753 | 17.8 | 70.3 | |
astandard deviation; bstandard error; cconfidence interval; dlongitudinal/transverse diameter ratio; elongitudinal/transverse-contour length ratio; fangle of retromolar pad line to residual alveolar ridge line.