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Table 5 Correlation between AKf change at 12-month and preoperative assessment variables

From: Different accelerated corneal collagen cross-linking treatment modalities in progressive keratoconus

Ch_AKf Preop UCVA Preop BCVA Preop Thin Preop Vol PreopCCT Preop AKf
Group 1 R 0.004 0.041 0.188 −0.088 0.244 −0.320
P 0.982 0.810 0.266 0.606 0.146 0.053
Group 2 R 0.031 0.059 −0.057 −0.136 −0.081 − 0.287
P 0.872 0.762 0.768 0.481 0.678 0.131
  1. UCVA = uncorrected visual acuity; BCVA = best-corrected visual acuity; Thin = thinnest point of cornea; Vol = corneal volume; CCT = central corneal thickness, AKf = apical keratometry front (Kmax); Ch_AKf = change in AKf at 12 months