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. 2020 Oct 29;10:18594. doi: 10.1038/s41598-020-75412-y

Table 2.

Correlation of each parameter in the KC and others groups: Pearson correlation coefficients.

Age at PK Postop period Graft size ACD IHT/CCT IGT/CCT Ks AvgK CYL Fourier analysis Kmax
Sph Reg Asym HOI
KC group
Current age 0.628 0.517 − 0.249 0.005 − 0.040 0.061 0.167 0.096 0.238 0.075 0.259 0.217 0.354 0.055
p < 0.0001 0.001 0.121 0.975 0.809 0.710 0.304 0.556 0.138 0.646 0.106 0.178 0.025 0.735
Age at PK − 0.342 0.081 0.108 − 0.113 0.026 0.214 0.147 0.251 0.132 0.291 0.227 0.402 0.157
p 0.031 0.621 0.507 0.487 0.873 0.184 0.366 0.118 0.418 0.069 0.159 0.010 0.334
Postop period − 0.389 − 0.120 0.077 0.044 − 0.035 − 0.046 0.012 − 0.054 − 0.007 0.013 − 0.015 − 0.103
p 0.013 0.462 0.637 0.785 0.833 0.779 0.942 0.739 0.968 0.938 0.927 0.526
Graft size − 0.265 0.503 0.564 − 0.417 − 0.439 − 0.124 − 0.439 − 0.135 − 0.339 − 0.368 − 0.434
p 0.098 0.001 < 0.0001 0.007 0.005 0.447 0.005 0.406 0.032 0.019 0.005
ACD − 0.622 − 0.438 0.543 0.603 0.073 0.608 0.120 0.368 0.359 0.668
p < 0.0001 0.005 0.0003 < 0.0001 0.656 < 0.0001 0.460 0.020 0.023 < 0.0001
IHT/CCT 0.754 − 0.696 − 0.658 − 0.383 − 0.645 − 0.427 − 0.576 − 0.523 − 0.759
p < 0.0001 < 0.0001 < 0.0001 0.015 < 0.0001 0.006 0.0001 0.001 < 0.0001
IGT/CCT − 0.530 − 0.534 − 0.212 − 0.531 − 0.222 − 0.401 − 0.327 − 0.556
p 0.0004 0.0004 0.189 0.0004 0.168 0.010 0.040 0.0002
Others group
Current age 0.815 0.069 0.044 − 0.059 0.275 0.183 0.093 0.112 − 0.029 0.085 − 0.101 0.200 − 0.037 0.028
p < 0.0001 0.674 0.786 0.718 0.086 0.259 0.570 0.490 0.861 0.604 0.535 0.216 0.819 0.862
Age at PK − 0.522 0.143 0.150 0.423 0.275 0.249 0.243 0.084 0.223 0.045 0.382 0.064 0.265
P 0.001 0.377 0.354 0.006 0.086 0.121 0.130 0.605 0.167 0.784 0.015 0.695 0.099
Postop period − 0.182 − 0.346 − 0.325 − 0.205 − 0.293 − 0.253 − 0.187 − 0.259 − 0.226 − 0.363 − 0.165 − 0.424
p 0.261 0.029 0.041 0.205 0.067 0.115 0.248 0.106 0.162 0.021 0.308 0.006
Graft size 0.355 0.260 − 0.007 0.037 0.012 0.078 0.028 0.128 − 0.022 0.099 0.149
p 0.025 0.106 0.965 0.820 0.941 0.632 0.863 0.430 0.895 0.543 0.359
ACD 0.089 − 0.017 0.316 0.321 0.075 0.360 0.155 0.162 0.332 0.517
p 0.587 0.915 0.047 0.044 0.645 0.023 0.338 0.319 0.036 0.001
IHT/CCT 0.752 − 0.078 − 0.088 0.007 − 0.094 0.009 0.151 − 0.047 − 0.015
p < 0.0001 0.633 0.587 0.965 0.564 0.958 0.351 0.775 0.929
IGT/CCT − 0.142 − 0.167 0.028 − 0.175 0.021 0.234 − 0.041 − 0.060
p 0.381 0.302 0.864 0.279 0.896 0.146 0.800 0.711

Underline values indicate p < 0.05.

KC keratoconus, PK penetrating keratoplasty, Postop period postoperative period, ACD anterior chamber depth, IHT inferior thinnest host cornea thickness, CCT central corneal thickness, IGT inferior thinnest graft thickness, IHT/CCT IHT ratio to CCT, IGT/CCT IGT ratio to CCT, Ks steepest corneal power, AveK average corneal power, CYL cylinder, Sph spherical, Reg regular astigmatism, Asym asymmetry, HOI higher order irregularity, Kmax maximum corneal power.