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Table 2 Correlations between biomechanical parameters and corneal sublayer thickness in the normal 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 0.184 0.330 0.760
P 0.479 0.195 0.000d
SP-A1c r −0.047 −0.152 0.730
P 0.869 0.588 0.000d
A1Va r 0.016 −0.034 −0.381
P 0.952 0.897 0.131
A2Va r −0.082 −0.168 0.116
P 0.753 0.519 0.656
PDa r 0.051 −0.008 −0.371
P 0.845 0.974 0.143
HCRa r 0.088 0.079 0.466
P 0.736 0.762 0.059
HCDfAa r 0.055 −0.008 −0.275
P 0.835 0.974 0.285
IRa r −0.155 −0.059 −0.549
P 0.552 0.821 0.023d
ARTha r 0.264 −0.010 0.465
P 0.307 0.970 0.060
DA ratioa r −0.149 −0.025 −0.523
P 0.568 0.924 0.031d
CBIb r −0.200 −0.088 −0.519
P 0.442 0.738 0.033d
TBIb r −0.159 −0.382 −0.178
P 0.541 0.131 0.495
  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