We have developed a simplified measuring system using an android device and a small speaker for hearing-aid adaptation tests, to measure parameters of sound field audiometry and the speech intelligibility test and the frequency response curve of hearing aids. In this paper, the measurement accuracy using this simplified system of parameters of sound field audiometry and the speech intelligibility test were evaluated in subjects with sensorineural or mixed hearing impairment with hearing amplification. The measurements in the audiometry and the speech intelligibility test were conducted with both an audiometer placed in a sound-proof room and our simplified system in an examination/treatment room. A total of 35 subjects participated in the sound field audiometry and 19 subjects in the sound field speech intelligibility test. The results showed that there were no differences in the results obtained between the measurements conducted with the audiometer in a sound-proof room and the measurements conducted using the simplified system in a treatment room. Thus, the simplified system showed adequate performance for hearing-aid adaptation tests under the condition of a background noise level of 60 dB(c). Furthermore, the results suggested that it was possible, by using the simplified system, to conduct the adaptation tests at a low cost and in a small space, without the need for a large-scale measuring device.

　　Thirteen years after the start of newborn hearing screenings (hereinafter,“NHS”) at the Fukushima General Rehabilitation Center starting in April 2004, we conducted a survey of 220 patients who had undergone the precision hearing testing and 45 patients who were deemed to have passed the NHS but went on to become deaf, and collected data on the subjects' hearing test results, their use of supportive devices, and the causative factors for deafness. Among the 233 deaf children receiving rehabilitation at this center, 45 (19.3%) had passed the NHS, indicating that early detection of progressive/late-onset deafness in children is also vital. Most of the children who were deaf in both ears after receiving the recommendation of one side needing closer examination and passing the NHS had mild/moderate deafness in both ears. The most common causative factors were hereditary factors in the cases of deafness in both ears, and meatal stenosis in the cases of deafness in one ear.

　　Earmold venting is effective for proper adjustment of the low-frequency responses of hearing aids and improvement of the wearing comfort. The aim of this study was to investigate the effectiveness of vented earmolds for electric-acoustic stimulation (EAS). A 43-year-old female patient underwent implantation of EAS. However, she could wear EAS for only less than nine hours per day, even when she was at work during working hours, because she did not feel comfortable wearing it for longer. To resolve this situation, we recommended that she use non-vented, parallel-vent, or Y-vent earmolds. We examined the hearing threshold levels and the monosyllable test scores and enquired about how she felt wearing EAS with the three different earmolds. The results showed that the patient at first felt more comfortable with the Y-vent earmold than with the other earmolds. However, she selected the non-vented earmold after using trying all the three earmolds for six months and is now able to wear her EAS throughout the day; she thought that the non-vented earmold provided the best hearing ability. Based on these results, we think that she can know each advantage fault was able to determine the merits and demerits of the types of earmolds by comparing them simultaneously. This is a simple method to encourage an individual to comfortably wear EAS.

　　A retrospective survey of 104 CODA was conducted to determine the actual status, related factors, and issues in the roles of CODA as interpreters for their parents. From their childhood (average: 6.48 years old), CODA are responsible for interpreting for their deaf parents, including proxy negotiations, instead of the parents, in various situations, representing the psychological burden of CODA. Of the CODA surveyed, 92 (88.5%) conducted conversation with their deaf parents using sign language and 74 (71.2%) using the Auditory/Oral Method, using gestures and writing together. The conversations were reported as being possible by only half of the surveyed CODA. Multiple regression analysis revealed that the frequency of interpreting was affected by two factors: both father and mother deaf and interpreting starting at a young age. Parent-child conversations were influenced by one factor, namely, of both the father and mother being deaf.

　　Early support for childcare is necessary for deaf parents, and to reduce the burden of interpreting, to provide psychological support and promote smooth conversation between parents and children for CODA, it is considered that the advice and support system of relevant experts is urgently needed.