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Table 4 Difference in counting data of parameters of Topolyzer 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*
ISV normal 158 (98.8) 173 (94.5) 0.097
suspect 1 (0.6) 7 (3.8)  
KC 1 (0.6) 3 (1.6)  
IVA normal 159 (99.4) 156 (85.2) < 0.001
suspect 1 (0.6) 15 (8.2)  
KC 0 (0.0) 12 (6.6)  
KI normal 156 (97.5) 135 (73.8) < 0.001
suspect 2 (1.3) 17 (9.3)  
KC 2 (1.3) 31 (16.9)  
CKI normal 160 (100.0) 183 (100.0)
KC 0 (0.0) 0 (0.0)  
RMin normal 160 (100.0) 183 (100.0)
KC 0 (0.0) 0 (0.0)  
IHA normal 155 (96.9) 160 (87.4) 0.003
suspect 3 (1.9) 5 (2.7)  
KC 2 (1.3) 18 (9.8)  
IHD normal 159 (99.4) 176 (96.2) 0.076
suspect 0 (0.0) 5 (2.7)  
KC 1 (0.6) 2 (1.1)  
ABR normal 123 (76.9) 136 (74.3) 0.583
KC 37 (23.1) 47 (25.7)  
Class KC 2 (1.3) 33 (18.0) < 0.001
Normal 158 (98.8) 150 (82.0)  
  1. TNG True Negative Group, FPG False Positive Group, KC keratoconus, ISV index of surface variance, IVA index of vertical asymmetry, KI keratoconus index, CKI center keratoconus index, RMin minimum sagittal curvature, IHA index of height asymmetry, IHD index of height decentration, ABR, zernike aberration coefficient
  2. *Pearson Chi square test was used, fisher exact test was used if number of one grid less than 1
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