TABLE 2.
Differences in bilateral differential topographic characteristics between groups.
| Parameters | KC group | Control group | Z a | p |
|---|---|---|---|---|
| Mean ± SD | Mean ± SD | |||
| ΔFKmax (D) | 16.35 ± 13.04 | 1.50 ± 1.12 | −15.254 | <0.001 |
| ΔFKmean (D) | 6.15 ± 5.05 | 0.45 ± 0.22 | −15.336 | <0.001 |
| ΔFKsd (D) | 3.94 ± 2.88 | 0.33 ± 0.21 | −15.341 | <0.001 |
| ΔFEmax (μm) | 44.9 ± 26.9 | 9.1 ± 4.2 | −15.285 | <0.001 |
| ΔFEmean (μm) | 16.8 ± 11.4 | 2.4 ± 1.1 | −15.254 | <0.001 |
| ΔFEsd (μm) | 10.8 ± 6.7 | 1.9 ± 0.9 | −15.301 | <0.001 |
| ΔBEmax (μm) | 81.2 ± 52.8 | 26.5 ± 18.7 | −13.213 | <0.001 |
| ΔBEmean (μm) | 30.4 ± 22.1 | 5.8 ± 3.6 | −14.648 | <0.001 |
| ΔBEsd (μm) | 19.4 ± 13.5 | 4.9 ± 2.7 | −14.286 | <0.001 |
| ΔCPmax (μm) | 58.6 ± 40.2 | 35.7 ± 14.6 | −6.261 | <0.001 |
| ΔCPmean (μm) | 21.5 ± 13.6 | 11.8 ± 4.2 | −8.204 | <0.001 |
| ΔCPsd (μm) | 14.7 ± 10.3 | 7.6 ± 2.7 | −8.240 | <0.001 |
ΔFKmax = the maximal front keratometry value within 1.5 mm radius of the bilateral differential topography; ΔFKmean = the mean front keratometry value within 1.5 mm radius of the bilateral differential topography; ΔFKsd = the standard deviation of the front keratometry values within 1.5 mm radius of the bilateral differential topography; ΔFEmax = the maximal front elevation value within 1.5 mm radius of the bilateral differential topography; ΔFEmean = the mean front elevation value within 1.5 mm radius of the bilateral differential topography; ΔFEsd = the standard deviation of the front elevation values within 1.5 mm radius of the bilateral differential topography; ΔBEmax = the maximal back elevation value within 1.5 mm radius of the bilateral differential topography; ΔBEmean = the mean back elevation value within 1.5 mm radius of the bilateral differential topography; ΔBEsd = the standard deviation of the back elevation values within 1.5 mm radius of the bilateral differential topography; ΔCPmax = the maximal corneal pachymetry value within 1.5 mm radius of the bilateral differential topography; ΔCPmean = the mean corneal pachymetry value within 1.5 mm radius of the bilateral differential topography; ΔCPsd = the the standard deviation of the corneal pachymetry values within 1.5 mm radius of the bilateral differential topography; KC = keratoconus; D = dioptor; μm = micron.
Mann-Whitney test.