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Table 2 Comparison of keratometry readings and symmetry indices between the two groups

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

  Group 1 (n = 37) Group 2 (n = 29) P
K1 (D) Preop 45.64 ± 2.8 45.88 ± 2.3 0.708
12-month postop 45.71 ± 2.91 45.30 ± 3.02 0.580
Mean change −0.07 ± 0.72 0.58 ± 2.03 0.001
P* 0.559 0.135  
K2 (D) Preop 49.10 ± 3.56 49.39 ± 3.06 0.727
12-month postop 49.19 ± 3.63 48.47 ± 3.27 0.408
Mean change −0.09 ± 0.79 0.92 ± 1.22 0.0001
P* 0.506 0.0001  
AvgK (D) Preop 47.3 ± 3.09 47.56 ± 2.56 0.715
12-month postop 47.37 ± 3.15 46.63 ± 2.76 0.322
Mean change −0.08 ± 0.69 0.93 ± 1.14 0.0001
P* 0.513 0.0001  
AKf (D) Preop 56.38 ± 5.26 56.29 ± 5.34 0.949
12-month postop 55.59 ± 4.98 54.44 ± 5.12 0.364
Mean change 0.79 ± 1.59 1.85 ± 1.58 0.003
P* 0.005 0.001  
AKb (D) Preop 80.9 ± 10.76 80.95 ± 12.09 0.985
12-month postop 84.61 ± 11.94 85.9 ± 12.64 0.672
Mean change −3.71 ± 6.06 −4.95 ± 4.35 0.108
P* 0.001 0.0001  
SIf (D) Preop 6.48 ± 3.74 6.6 ± 3.63 0.900
12-month postop 6.14 ± 3.57 5.72 ± 3.44 0.631
Mean Change 0.34 ± 0.93 0.88 ± 0.83 0.008
P* 0.031 0.0001  
SIb (D) preop 1.67 ± 0.84 1.63 ± 0.82 0.845
12-month postop 1.75 ± 0.79 1.7 ± 0.85 0.796
Mean change −0.08 ± 0.26 −0.06 ± 0.29 0.999
P* 0.091 0.254  
  1. K1 = flat keratometry; K2 = steep keratometry; AvgK = average keratometry; AKf = apical keratoscopy front (Kmax); AKb = apical keratoscopy back; SIf = symmetry index front; SIb = symmetry index back; D = Diopters
  2. P: Paired t test; P*: Student’s t-test; Values in bold are significant (P < 0.05)