Ising H, Hanel J, Pilgramm M, Babisch W, Lindthammer A
Umweltbundesamt, Institut für Wasser-, Boden- und Lufthygiene, Berlin.
HNO. 1994 Dec;42(12):764-8.
Sound levels of music played from mini-cassette players via headphones were measured in a nonrepresentative group of 681 pupils whose ages were between 10 to 19 years. Each pupil completed a questionnaire giving the total time spent listening to music each day. The pupils set the music levels (free field corrected short time Leq) between 60 dB(A) and 110 dB(A). In the age group from 12-16 years, 10% chose 110 dB(A). Nearly 50% of the total group usually listened to music less than one hour per day, and just less than 10% listened for four or more hours. The energy equivalent of continuous sound pressure level for an exposure time of 8 h per day was for 55% Leq 8 h < 66 dB(A) and for 7% Leq 8 h > 95 dB(A) while 4% had an Leq 8 h > 105 dB(A). Estimation of the expected hearing losses (HL) were based on ISO 1999: about 10% of the total group were predicted to have a HL > 10 dB at 4 kHz after 5 years. After listening to sound in this manner 0.3% were expected to develop hearing losses at age 25 years that would be severe enough to substantially impair speech intelligibility.
在一组681名年龄在10至19岁之间的非代表性学生中，测量了通过耳机播放的迷你盒式磁带播放器所播放音乐的声级。每个学生都填写了一份问卷，给出了每天听音乐的总时长。学生们将音乐声级（自由场修正短时间等效连续A声级）设置在60分贝（A）至110分贝（A）之间。在12至16岁的年龄组中，10%的学生选择了110分贝（A）。在整个组中，近50%的学生通常每天听音乐少于1小时，而只有不到10%的学生听音乐4小时或更长时间。每天暴露8小时的连续声压级的能量等效值，55%的学生等效连续A声级8小时<66分贝（A），7%的学生等效连续A声级8小时>95分贝（A），而4%的学生等效连续A声级8小时>105分贝（A）。预期听力损失（HL）的估计基于ISO 1999：预计在整个组中，约10%的学生在5年后4千赫兹处的听力损失>10分贝。以这种方式听声音后，预计0.3%的学生在25岁时会出现严重到足以显著损害言语清晰度的听力损失。
