Davanager et al correlated intraocular pressure (IOP) readings and the probability of glaucoma. The authors are from the University of Oslo in Norway.
|
Pressure in mm Hg |
Probability Glaucoma |
|
18 |
0.016 |
|
19 |
0.021 |
|
20 |
0.031 |
|
21 |
0.047 |
|
22 |
0.068 |
|
23 |
0.101 |
|
24 |
0.147 |
|
25 |
0.225 |
|
26 |
0.319 |
|
27 |
0.45 |
|
28 |
0.576 |
|
29 |
0.717 |
|
30 |
0.822 |
|
31 |
0.893 |
|
32 |
0.942 |
|
33 |
0.969 |
|
34 |
0.984 |
|
35 |
0.995 |
data extracted from Figure 4. page 567
The data has the appearance of a cumulative probability curve.
X =
= (0.01347 * ((pressure reading)^2)) - (0.1776 * (pressure reading)) - 5.265
probability of glaucoma =
= 1 / (1 + EXP((-1) * X))
Alternatively
|
Pressure Range |
Probability Equation |
|
18 to 25 |
(0.5262 * ((pressure)^2)) - (19.86 * (pressure)) + 189.2 |
|
25 to 30 |
(12.3 * (pressure)) - 286.4 |
|
30 to 35 |
(-0.7786 * ((pressure)^2)) + (53.94 * (pressure)) - 834.9 |
Specialty: Ophthalmology
