TABLE 3.
Comparison of Tomographic Parameters for Normal and FFKC Groups
| Parameter | Normal Group Mean ± SD (Range) | FFKC Group Mean ± SD (Range) | Pa |
|---|---|---|---|
| BAD-D | 0.52 ± 0.50 (−0.68 to 1.34) | 1.84 ± 1.34 (−0.22 to 7) | < .0001b |
| ART Maximum | 497.90 ± 72.82 (403 to 663) | 379.80 ± 88.49 (250 to 593) | < .0001b |
| ART Average | 608.11 ± 78.86 (486 to 807) | 495.04 ± 89.09 (329 to 718) | < .0001b |
| Elevation B BFS 8-mm Thinnest | 1.52 ± 3.10 ( (−3 to 9) | 7.47 ±.5.65 (−5 to 18) | < .0001b |
| Elevation B BFTE 8-mm Thinnest | −1.44 ± 2.83 (−7 to 7) | 3.95 ± 4.89 (−8 to 14) | < .0001b |
| Elevation B BFTE 8-mm Max 4-mm Zone | 6.81 ± 2.01 (4 to 13) | 9.57 ± 3.20 (18 to 4) | < .0001b |
| RPI Maximum | 1.05 ± 0.16 (0.82 to 1.36) | 1.41 ± 0.28 (0.91 to 1.94) | < .0001b |
| RPI Average | 0.87 ± 0.10 (0.68 to 1.04) | 1.03 ± 0.16 (0.73 to 1.47) | < .0001b |
| Enhanced BFS Front 8 mm | 7.93 ± 0.22 (7.38 to 8.57) | 7.81 ± 0.20 (7.44 to 8.1) | .0413 |
| Elevation B BFTE 8-mm Apex | −1.31 ± 3.14 (−8 to 8) | 0.80 ± 4.47 (−7 to 11) | .043 |
| Enhanced BFS Back 8 mm | 6.57 ± 0.22 ( 5.97 to 7.17) | 6.47 ± 0.23 (6.05 to 6.86) | .1232 |
| IHD | 3.60 ± 2.28 (0.001 to 8) | 4.85 ± 3.07 (0.001 to 8) | .1677 |
| Elevation B BFS 8-mm Apex | 0.78 ± 2.28 (−3 to 9) | 2.23 ± 4.04 (−4 to 13) | .2217 |
| ISV | 21.32 ± 7.42 (46 to 8) | 19.33 ± 5.23 (10 to 31) | .446 |
| Elevation B BFS 8-mm Max 4-mm Zone | 13.53 ± 4.63 (4 to 26) | 14.52 ± 4.94 (7 to 27) | .4539 |
| IVA | 0.37 ± 1.17 9 (0.04 to 7) | 0.16 ± 0.06 (0.09 to 0.3) | .6456 |
FFKC = forme fruste keratoconus, SD = standard deviation; BAD-D = Belin/Ambrósio display; ART = Ambrósio relational thickness; BFS = best fit sphere; BFTE = best fit toric ellipsoid; RPI = relative pachymetric increase; IHD = index of height decentration; ISV = index suface variance; IVA = index of vertical asymmetry
a
Mann–Whitney U test.
b
Statistically significant difference after Bonferroni correction.