Table 2.

The significance (P value) of comparing indices between every 2 groups.

Compared groups	(<21 years) versus (21–40 years)	(<21 years) versus (>40 years)	(21–40 years) versus (>40 years)
Test	Mann–Whitney	Mann–Whitney with exact significance	Mann–Whitney
AE from BFS	0.624	0.001∗	0.002∗
PE from BFS	0.022∗	0.005∗	0.092
PE minus AE from BFS	0.008∗	0.001∗	0.004∗
PPI avg	0.038∗	0.094	0.001∗
PPI max	0.106	0.268	0.015∗
ART avg	0.080	0.112	0.002∗
ART max	0.194	0.145	0.012∗
Diagonal decentration	0.061	0.471	0.025∗

AE from BFS: anterior elevation from the best-fit sphere, PE from BFS: posterior elevation from the best-fit sphere, PPI avg: average corneal pachymetry progression index, PPI max: maximum corneal pachymetry progression index, ART avg: average Ambrosio's relational thickness index, ART max: maximum Ambrosio's relational thickness index. ^∗Statistical significance (P < 0.05).