Table 3.
OCT-based epithelial thickness data in normal, suspect keratoconus, and keratoconus groups.
| Epithelial thickness (μm) | Normal | SKC | KC | ANOVA | P values | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Range | Mean | SD | Range | Mean | SD | Range | P value | SKC vs. normal | KC vs. normal | KC vs. SKC | ||||
| Min ET (0_2) | 47.57 | 4.1 | 33 | 58 | 45.74 | 4.25 | 38 | 58 | 37.26 | 4.51 | 30 | 52 | <0.0001 | 0.097 | <0.0001 | <0.0001 |
| Avg ET (0_2) | 49.66 | 3.71 | 38 | 60 | 48.47 | 4.4 | 41 | 63 | 43.71 | 4.93 | 36 | 57 | <0.0001 | 0.486 | <0.0001 | <0.0001 |
| Max ET (0_2) | 51.34 | 3.88 | 44 | 62 | 50.91 | 4.61 | 43 | 66 | 50.88 | 7.5 | 42 | 81 | 0.8813 | |||
| Min-Max ET (0_2) | −3.77 | 3.17 | −20 | −1 | −5.16 | 2.74 | −11 | −1 | −13.62 | 6.58 | −39 | −4 | <0.0001 | 0.288 | <0.0001 | <0.0001 |
| Min ET (2_5) | 44.45 | 3.56 | 33 | 54 | 42.84 | 3.51 | 37 | 55 | 35.68 | 4.48 | 29 | 48 | <0.0001 | 0.106 | <0.0001 | <0.0001 |
| Avg Et (2_5) | 48.75 | 3.38 | 42 | 60 | 48.56 | 3.77 | 42 | 59 | 47.21 | 5.23 | 39 | 63 | 0.1837 | |||
| Max ET (2_5) | 52.6 | 4.7 | 45 | 69 | 53.3 | 5.15 | 43 | 69 | 57.26 | 8.77 | 47 | 94 | 0.0016 | 1 | 0.001 | 0.016 |
| S-I ET (2_5) | −1.55 | 3.14 | −6 | 11 | 0.74 | 8.38 | −9 | 50 | 6.62 | 9.16 | −4 | 48 | <0.0001 | 0.289 | <0.0001 | 0.001 |
| SN-IT ET (2_5) | −0.1 | 3 | −8 | 14 | 1.72 | 3.73 | −10 | 10 | 9.35 | 4.7 | 1 | 19 | <0.0001 | 0.046 | <0.0001 | <0.0001 |
| Min-Max (2_5) | −8.15 | 4.65 | −26 | −3 | −10.47 | 4.18 | −22 | −4 | −21.59 | 7.79 | −52 | −11 | <0.0001 | 0.0004 | <0.0001 | <0.0001 |
| CET | 49.92 | 3.98 | 36 | 60 | 48.49 | 4.88 | 41 | 63 | 42.97 | 5.38 | 33 | 55 | <0.0001 | 0.373 | <0.0001 | <0.0001 |
Min = minimum; ET = epithelial thickness; Avg = average; Max = maximum; Min-Max = minimum-maximum; S-I = superior-inferior; SN-IT = superonasal-inferotemporal; CET = central epithelial thickness; SKC = suspect keratoconus; KC = keratoconus; SD = standard deviation. Statistically significant values (P < 0.05). Values in bold are statistically significant.