Diagnostic Sensitivity of Different Reference Bodies When Using Scheimpflug Tomography in a Myopic Population with Keratoconus
Table 2
Mean, median, standard deviation, and percentiles for each measurement point in the normal and keratoconic population.
Parameter
Group
Mean
SD
Median
Percentiles
2.5%
5%
95%
97.5%
BFS
KC myopic
29.0
8.34
27.1
15.3
17.5
42.0
44.5
<0.001
RMS-P
Normal myopic
15.1
6.97
13.7
5.33
5.91
28.2
31.5
BFS AA
KC myopic
5.02
4.68
4.00
−2.00
0.00
14.9
18.0
<0.001
Normal myopic
1.80
1.11
2.00
0.00
0.00
4.00
4.00
BFS PA
KC myopic
13.3
12.8
12.0
−10.9
−3.00
32.0
35.9
<0.001
Normal myopic
1.96
3.06
2.00
−4.00
−3.00
8.0
8.0
BFS AT
KC myopic
13.0
5.80
12.0
5.00
6.00
23.0
27.0
<0.001
Normal myopic
2.21
1.71
2.00
−0.55
0.00
5.00
5.55
BFS PT
KC myopic
34.7
12.7
32.0
18.0
19.0
53.0
70.8
<0.001
Normal myopic
4.81
4.31
4.00
−2.55
−1.00
13.0
15.6
BFTEFE
KC myopic
13.6
4.73
12.4
6.40
8.14
22.2
25.0
<0.001
RMS-P
Normal myopic
4.20
1.35
4.07
2.36
2.50
6.84
7.60
BFTEFE
KC myopic
3.51
4.63
3.00
−2.98
−2.00
13.0
16.9
<0.001
AA
Normal myopic
−0.27
1.07
0.00
−2.00
−2.00
1.00
2.00
BFTEFE
KC myopic
10.3
12.6
9.50
−12.9
−6.00
29.9
33.9
<0.001
PA
Normal myopic
−1.90
3.18
−2.00
−8.00
−7.00
4.00
4.55
BFTEFE
KC myopic
7.96
5.48
6.00
1.02
2.00
20.0
21.0
<0.001
AT
Normal myopic
−0.21
0.93
0.00
−2.00
−2.00
1.00
1.00
BFTEFE
KC myopic
24.4
12.0
22.5
9.00
10.0
45.8
57.8
<0.001
PT
Normal myopic
0.07
2.80
0.00
−5.00
−4.10
5.00
6.55
BFTE
KC myopic
10.2
3.79
9.45
4.27
4.92
17.1
18.1
<0.001
RMS-P
Normal myopic
3.84
1.09
3.73
2.20
2.34
6.03
6.33
BFTE AA
KC myopic
−0.79
2.23
−1.00
−4.97
−4.00
3.00
4.97
0.469
Normal myopic
−0.35
0.67
0.00
−1.00
−1.00
1.00
1.00
BFTE PA
KC myopic
−1.61
5.16
−1.00
−11.0
−9.00
5.95
6.00
0.068
Normal myopic
−3.11
1.44
−3.00
−6.00
−6.00
−1.00
0.00
BFTE AT
KC myopic
3.15
3.10
3.00
−1.98
0.00
8.90
11.0
<0.001
Normal myopic
−0.29
0.69
0.00
−2.00
−1.00
1.00
1.00
BFTE PT
KC myopic
10.5
7.41
9.00
−1.00
−0.95
21.0
24.0
<0.001
Normal myopic
−1.05
2.40
−1.00
−5.00
−5.00
3.00
4.00
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.
