Table 2.
Roc curve analysis for the ability of different parameters to differentiate between forme fruste keratoconus eye and control eyes
| parameter | AUC | SE | 95%CI | P value | cutoff | sensitivity | specificity |
|---|---|---|---|---|---|---|---|
| Ks | 0.6 | 0.092 | 0.42,0.78 | 0.353 | 42.5 | 64% | 50% |
| Kf | 0.5 | 0.091 | 0.3,0.6 | 0.93 | NA | NA | NA |
| Km | 0.82 | 0.06 | 0.68,0.95 | 0.353 | 42.4 | 64% | 80% |
| CCT | 0.58 | 0.1 | 0.38,0.77 | 0.446 | NA | NA | NA |
| CT min | 0.61 | 0.6 | 0.4,0.8 | 0.3 | 516 | 60% | 80% |
| PE | 0.45 | 0.129 | 0.02,0.07 | 0.67 | NA | NA | NA |
| BDE | 0.60 | 0.094 | 0.41,0.77 | 0.38 | 3.5 | 53% | 80% |
| PPI avg | 0.404 | 0.016 | o.19,o.61 | 0.37 | NA | NA | NA |
| PPI max | 0.64 | 0.093 | 0.64,0.83 | 0.174 | 1.31 | 50% | 70% |
| ART avg | 0.57 | 0.10 | 0.36,0.78 | 0.486 | NA | NA | NA |
| ART min | 0.56 | 0.10 | 0.35,0.77 | 0.551 | NA | NA | NA |
| ART max | 0.88 | 0.056 | 0.77,0.99 | < 0.001 | 404 | 82% | 70% |
| D index | 0.67 | 0.102 | 0.47,0.87 | 0.097 | 1.2 | 71% | 60% |
ART Ambrosio relational thickness, AUC area under curve, avg. average, BDE back difference elevation, CCT central corneal thickness, CI confidence interval, CT min minimum corneal thickness, D index multimetric D, Kf flat keratometry, Km mean keratometry, Ks steep keratometry, max maximum, min minimum, NA not applicable,SE standard error, PE posterior elevation, PPI pachymetric progression index