Table 1.
Mean, standard deviation, and statistical significance of different indices among the three age groups.
| <21 years | 21 to 40 years | >40 years | Kruskal-Wallis test (P value) | ||||
|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | ||
| Age | 19.5 | 1.2 | 28.7 | 4.5 | 44.6 | 1.8 | |
| SE | −5.24 | 5.01 | −4.51 | 2.26 | −4.31 | 2.71 | |
| AE from BFS | 2.9 | 1.2 | 2.7 | 1.4 | 1.3 | 1.1 | 0.003∗ |
| PE from BFS | 1.4 | 3.0 | 3.9 | 4.2 | 5.3 | 3.3 | 0.010∗ |
| PE from BFTE | 3.3 | 2.7 | 4.0 | 3.9 | 5.7 | 5.0 | 0.427 |
| PE minus AE from BFS | −1.5 | 2.9 | 1.2 | 3.9 | 4.0 | 3.0 | <0.001∗ |
| Apex thickness | 541.6 | 35.9 | 547.3 | 30.4 | 559.3 | 36.9 | 0.602 |
| CCT | 541.5 | 35.6 | 547.7 | 30.5 | 560.1 | 37.3 | 0.632 |
| TCT | 540.3 | 35.4 | 545.6 | 31.1 | 558.0 | 36.9 | 0.623 |
| PPI min | 0.505 | 0.151 | 0.548 | 0.150 | 0.482 | 0.108 | 0.218 |
| PPI avg | 0.779 | 0.132 | 0.845 | 0.129 | 0.700 | 0.089 | <0.001∗ |
| PPI max | 1.021 | 0.132 | 1.086 | 0.168 | 0.964 | 0.129 | 0.024∗ |
| ART min | 1184.9 | 423.9 | 1103.7 | 443.5 | 1236.8 | 400.0 | 0.26 |
| ART avg | 713.7 | 134.4 | 661.1 | 110.2 | 812.6 | 143.6 | 0.003∗ |
| ART max | 538.3 | 81.4 | 513.6 | 82.4 | 588.8 | 90.5 | 0.026∗ |
| Thinnest dX | 0.059 | 0.488 | 0.021 | 0.595 | −0.028 | 0.413 | 0.877 |
| Thinnest dY | −0.222 | 0.159 | −0.286 | 0.210 | −0.237 | 0.207 | 0.41 |
| Diagonal decentration | 0.522 | 0.175 | 0.645 | 0.244 | 0.465 | 0.190 | 0.026∗ |
AE from BFS: anterior elevation from the best-fit sphere, PE from BFS: posterior elevation from the best-fit sphere, PE from BFTE: posterior elevation from the best-fit toric ellipsoid, CCT: thickness at pupil centroid, TCT: the thinnest-point thickness, PPI min: minimum corneal pachymetry progression index, PPI avg: average corneal pachymetry progression index, PPI max: maximum corneal pachymetry progression index, ART min: minimum Ambrosio's relational thickness index, ART avg: average Ambrosio's relational thickness index, ART max: maximum Ambrosio's relational thickness index, thinnest dX: the thinnest-point displacement at x-axis, thinnest dY: the thinnest-point displacement at y-axis. ∗Values flagged as statistically significant differences.