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Table 2 Difference in counting data of parameters of Sirius between True Negative Group and False Positive Group

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

  

TNG

FPG

P*

N

(%)

N

(%)

SIf

normal

160

(100.0)

107

(58.5)

< 0.001

suspect

0

(0.0)

52

(28.4)

 

KC

0

(0.0)

24

(13.1)

 

SIb

normal

158

(98.8)

110

(60.1)

< 0.001

suspect

2

(1.3)

65

(35.5)

 

KC

0

(0.0)

8

(4.4)

 

BCVf

normal

160

(100.0)

176

(96.2)

0.016

suspect

0

(0.0)

7

(3.8)

 

KC

0

(0.0)

0

(0.0)

 

BCVb

normal

159

(99.4)

163

(89.1)

< 0.001

suspect

1

(0.6)

16

(8.7)

 

KC

0

(0.0)

4

(2.2)

 

KVf

normal

160

(100.0)

183

(100.0)

abnormal

0

(0.0)

0

(0.0)

 

KVb

normal

144

(90.0)

117

(63.9)

< 0.001

abnormal

16

(10.0)

66

(36.1)

 

ThkMin

< 471

0

(0.0)

2

(1.1)

0.005

471–482

0

(0.0)

8

(4.4)

 

> 482

160

(100.0)

173

(94.5)

 

Class

Normal

160

(100.0)

75

(41.0)

< 0.001

SK

0

(0.0)

108

(59.0)

 
  1. TNG True Negative Group, FPG False Positive Group, KC keratoconus, SIf symmetry index of front corneal curvature (< 0.85 normal, 0.85–1.25 suspect, > 1.25 KC); SIb, symmetry index of back corneal curvature (< 0.22 normal, 0.22–0.37 suspect, > 0.37 KC); BCVf, Baiocchi Calossi Versaci front (< 0.80 normal, 0.80–1.20 suspect, > 1.20 KC); BCVb, Baiocchi Calossi Versaci back (< 0.80 normal, 0.80–1.20 suspect, > 1.20 KC); KVf, keratoconus vertex front (<15um normal, > = 15um abnormal); KVb, keratoconus vertex back (<15um normal, > = 15um abnormal); ThkMin, minimum thickness
  2. * Pearson Chi square test was used, fisher exact test was used if number of one grid less than 1