Effect of Age on Pentacam Keratoconus Indices

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 ( 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.