Effect of Age on Pentacam Keratoconus Indices

Table 2

The significance ( 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 ().