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Table 3 Mean differences for IOP measurements in pre-surgery with GAT and at 3 and 12 months after surgery with GAT, CT and IOPcc

From: Intraocular pressure after myopic laser refractive surgery measured with a new Goldmann convex prism: correlations with GAT and ORA

  IOP difference GAT3M - GATpre GAT12M -
GATpre
CT3M - GATpre CT12M - GATpre CT3M -IOPcc3M CT12M -IOPcc12M
All md (bias) −3.80 −2.43 −0.0333 0.533 2.70 3.27
Wilcoxon test Z = -4.747;p < 0.000 Z = -3904;p < 0.000 Z = -0.361;p = 0.718 Z = -0.888;p = 0.375 Z = -3.754;p < 0.000 Z = -4.618;p < 0.000
LASIK
GV
md (bias) −4.52 −2.74 −1.11 0.158 2.04 2.91
Wilcoxon test Z = -3.836;p < 0.000 Z = -3.209;p < 0.001 Z = -2.017;
p = 0.440
Z = -0.776;p = 0.438 Z = -2.636;
p = 0.008
Z = -3.582;p < 0.000
PRK md (bias) −2.54 −1.91 1.82 1.18 3.83 3.89
Wilcoxon test Z = -2.185;p < 0.005 Z = -2.203;p = 0.028 Z = -1.616;p = 0.106 Z = -6.55;p = 0.512 Z = -2.667;p = 0.008 Z = -2.936;p = 0.03
  1. Mean differences between GATpre, GAT, IOPcc and CT after surgery (at 3 and 12 months) were calculated and tested for the absence of differences using the Wilcoxon test. Significant differences are marked in bold. md, mean difference; Z, Wilcoxon test; p, probability value
  2. GAT Goldmann applanation tonometer, CT Convex tonometer, IOPg Goldmann-correlated IOP, IOPcc Corneal-compensated IOP, M Months