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Table 3 Difference in counting data of parameters of Pentacam between True Negative Group and False Positive Group

From: The possible causes for tomography suspect Keratoconus in a Chinese cohort

 

TNG

FPG

 

N

(%)

N

(%)

P*

Df

normal

155

(96.9)

125

(68.3)

< 0.001

suspect

5

(3.1)

53

(29.0)

 

KC

0

(0.0)

5

(2.7)

 

Db

normal

159

(99.4)

166

(90.7)

0.001

suspect

1

(0.6)

14

(7.7)

 

KC

0

(0.0)

3

(1.6)

 

Dp

normal

154

(96.3)

129

(70.5)

< 0.001

suspect

6

(3.8)

46

(25.1)

 

KC

0

(0.0)

8

(4.4)

 

Dt

normal

160

(100.0)

167

(91.3)

0.001

suspect

0

(0.0)

15

(8.2)

 

KC

0

(0.0)

1

(0.5)

 

Da

normal

159

(99.4)

160

(87.4)

< 0.001

suspect

1

(0.6)

23

(12.6)

 

KC

0

(0.0)

0

(0.0)

 

D

normal

160

(100.0)

50

(27.3)

< 0.001

suspect

0

(0.0)

133

(72.7)

 

KC

0

(0.0)

0

(0.0)

 

ThkMin

normal

160

(100.0)

167

(91.3)

< 0.001

suspect

0

(0.0)

15

(8.2)

 

KC

0

(0.0)

1

(0.5)

 

ISV

normal

160

(100.0)

183

(100.0)

suspect

0

(0.0)

0

(0.0)

 

KC

0

(0.0)

0

(0.0)

 

IVA

normal

159

(99.4)

179

(97.8)

0.377

suspect

1

(0.6)

4

(2.2)

 

KC

0

(0.0)

0

(0.0)

 

KI

normal

158

(98.8)

152

(83.1)

< 0.001

suspect

2

(1.3)

17

(9.3)

 

KC

0

(0.0)

14

(7.7)

 

CKI

normal

160

(100.0)

183

(100.0)

KC

0

(0.0)

0

(0.0)

 

IHA

normal

159

(99.4)

178

(97.3)

0.126

suspect

0

(0.0)

4

(2.2)

 

KC

1

(0.6)

1

(0.5)

 

IHD

normal

124

(77.5)

75

(41.0)

< 0.001

suspect

11

(6.9)

22

(12.0)

 

KC

25

(15.6)

86

(47.0)

 

RMin

normal

160

(100.0)

183

(100.0)

KC

0

(0.0)

0

(0.0)

 

Class

Normal

157

(98.1)

147

(80.3)

< 0.001

possible

3

(1.9)

35

(19.1)

 

KC

0

(0.0)

1

(0.5)

 
  1. TNG True Negative Group, FPG False Positive Group, KC keratoconus, Df deviation of front elevation difference map, Db deviation of back elevation difference map, Dp deviation of average pachymetric progression index, Dt deviation of minimum thickness, Da deviation of Ambrosio’s Relational Thickness maximum, D Belin/Ambrosio enhanced ectasia total derivation value, ThkMin minimum thickness, ISV index of surface variance, IVA index of vertical asymmetry, KI keratoconus index, IHA index of height asymmetry, IHD index of height decentration, CKI center keratoconus index, RMin minimum sagittal curvature
  2. * Pearson Chi square test was used, fisher exact test was used if number of one grid less than1