Gristwood and Venables developed a model for predicting the risk of tinnitus in a patient with otosclerosis. The authors are from Royal Adelaide Hospital and the University of Adelaide in Australia.
Tinnitus was classified as present or absent.
Parameters for model:
(1) gender (0 for male, 1 for female)
(2) threshold for bone conduction (BC) in decibels (determined as the average of the readings at 0.5, 1, 2 and 3 kHz, which represent the speech frequencies)
bone conduction threshold in decibels =
= ((threshold at 0.5 kHz) + (threshold at 1.0 kHz) + (threshold at 2.0 kHz) + (threshold at 3.0 kHz)) / 4
X =
= (0.584 * (points for gender)) - (0.014 * (bone conduction threshold in decibels)) + 0.810
probability of tinnitus =
= EXP(X) / (1 + EXP(X))
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