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Table 3 Correlations between biomechanical parameters and corneal sublayer thickness in the KC group

From: Relationship between corneal biomechanical parameters and corneal sublayer thickness measured by Corvis ST and UHR-OCT in keratoconus and normal eyes

   EPT BLT STT
SP-A1a r 0.427 0.527 0.515
P 0.033d 0.007d 0.008d
SP-A1c r 0.456 0.509 0.533
P 0.029d 0.013d 0.009d
A1Va r −0.355 −0.574 −0.495
P 0.082 0.003d 0.012d
A2Va r 0.028 0.488 0.676
P 0.895 0.013d 0.000d
PDa r −0.102 −0.431 −0.351
P 0.627 0.031d 0.085
HCRa r 0.447 0.276 0.150
P 0.025* 0.181 0.474
HCDfAa r −0.346 −0.495 −0.355
P 0.090 0.012d 0.081
IRb r −0.483 −0.495 −0.362
P 0.015d 0.012d 0.075
ARTha r 0.292 0.130 0.560
P 0.157 0.537 0.004d
DA ratioa r −0.544 −0.390 −0.484
P 0.005d 0.054 0.014d
CBIb r −0.145 0.005 −0.325
P 0.488 0.981 0.112
TBI r
P
  1. EPT = epithelial thickness; BLT = Bowman’s layer thickness; STT = stromal thickness; SP-A1 = stiffness parameter at first applanation; A1V = corneal apex velocity at first applanation; A2V = corneal apex velocity at second applanation; PD = peak distance; HCR = highest concavity radius of curvature; HCDfA = deflection amplitude at highest concavity; IR = integrated radius; ARTh = Ambrosio relational thickness to the horizontal profile; DA = deformation amplitude; CBI = Corvis biomechanical index; TBI = tomographic and biomechanical index; aPearson correlation test; bSpearman correlation test; cPartial correlation analysis controlling for the thickness of the other two layers; dP < 0.05