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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
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