1996 Volume 39 Issue 2 Pages 184-188
Epidemiological studies on acute profound deafness by sending questionaries to the hospitals which were randomly sampled throughout Japan, including university hospitals were done between January 1 and December 31, 1993. The reporting rate of the questionarier was 49.6%. In the first quesionare, the number of patients with deafness who received treatment in 1993 was estimated as follows; 1) sudden deafness in 24, 000 (95% CI 21, 000-27, 000) patients, 2) idiopathic bilateral sensorineural hearing loss in 700 (500-900), 3) mumps deafness in 400 (300-500), 4) perceptive deafness secondary due to the immuno-disorders in 200 (100-300).
In the second quesionate, informations were obtained individually in order to elucidate the clinical manifestations of these disease. The results will be published in near future.
