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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)
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