Table 2: Mean, median, standard deviation, and percentiles for each measurement point in the normal and keratoconic population.

ParameterGroupMeanSDMedianPercentiles
2.5%5%95%97.5%

BFSKC myopic29.08.3427.115.317.542.044.5<0.001
RMS-PNormal myopic15.16.9713.75.335.9128.231.5

BFS AAKC myopic5.024.684.00−2.000.0014.918.0<0.001
Normal myopic1.801.112.000.000.004.004.00

BFS PAKC myopic13.312.812.0−10.9−3.0032.035.9<0.001
Normal myopic1.963.062.00−4.00−3.008.08.0

BFS ATKC myopic13.05.8012.05.006.0023.027.0<0.001
Normal myopic2.211.712.00−0.550.005.005.55

BFS PTKC myopic34.712.732.018.019.053.070.8<0.001
Normal myopic4.814.314.00−2.55−1.0013.015.6

BFTEFEKC myopic13.64.7312.46.408.1422.225.0<0.001
RMS-PNormal myopic4.201.354.072.362.506.847.60

BFTEFEKC myopic3.514.633.00−2.98−2.0013.016.9<0.001
AANormal myopic−0.271.070.00−2.00−2.001.002.00

BFTEFEKC myopic10.312.69.50−12.9−6.0029.933.9<0.001
PANormal myopic−1.903.18−2.00−8.00−7.004.004.55

BFTEFEKC myopic7.965.486.001.022.0020.021.0<0.001
ATNormal myopic−0.210.930.00−2.00−2.001.001.00

BFTEFEKC myopic24.412.022.59.0010.045.857.8<0.001
PTNormal myopic0.072.800.00−5.00−4.105.006.55

BFTEKC myopic10.23.799.454.274.9217.118.1<0.001
RMS-PNormal myopic3.841.093.732.202.346.036.33

BFTE AAKC myopic−0.792.23−1.00−4.97−4.003.004.970.469
Normal myopic−0.350.670.00−1.00−1.001.001.00

BFTE PAKC myopic−1.615.16−1.00−11.0−9.005.956.000.068
Normal myopic−3.111.44−3.00−6.00−6.00−1.000.00

BFTE ATKC myopic3.153.103.00−1.980.008.9011.0<0.001
Normal myopic−0.290.690.00−2.00−1.001.001.00

BFTE PTKC myopic10.57.419.00−1.00−0.9521.024.0<0.001
Normal myopic−1.052.40−1.00−5.00−5.003.004.00

AA, anterior elevation at the apex; AT, anterior elevation at the thinnest point; BFS, best fit sphere; BFTE, best fit toric ellipsoid; BFTEFE, best fit toric ellipsoid with fixed eccentricity; KC, keratoconus; RMS-P, root mean square of posterior elevations; SD, standard deviation; PA, posterior elevation at the apex; PT, posterior elevation at the thinnest point.