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对语频平均听损及4KHz 听损,均用 9个自变数(性别,工龄,年龄,日连续等效 A 声级,庆大霉素注射史,吸烟史,链霉素注射史,家族耳聋史,射击史——曾应征入伍或参加民兵使用过轻重武器者)进行逐步回归分析,发现日连续等效 A 声级及年龄因素起作用较大,而工龄因素未选入。进一步回归分析,发现接触者在40岁以前对噪声的听力损伤作用敏感,而40岁以后则不敏感。又设工人年龄为40岁,日连续等效 A 声级为85dB(A),其他自变数 x_i 均为零时,推算出左、右耳语频平均听损均在25dB 以上,说明日连续等效 A 声级即使为85dB(A)时,仍可引起耳聋,因而是不安全的。
Average hearing loss and 4 Hz hearing loss were evaluated using nine independent variables (gender, age, age, day-to-day equivalent A sound level, gentamicin injection history, smoking history, history of streptomycin injections, family deafness History and shooting history - those who had been enlisted or participated in the militia’s use of light and heavy weapons) conducted a stepwise regression analysis and found that the daily continuous equivalent A sound level and age factor played a greater role, while the length of service was not selected. Further regression analysis revealed that the contact was sensitive to noise-induced hearing impairment before the age of 40 years and was insensitive to the age of 40 years. Also set the working age of 40 years, day continuous equivalent A sound level is 85dB (A), the other independent variables x_i are zero, calculate the average hearing loss of left and right ears are above 25dB, indicating that the continuous equivalent A sound level even at 85dB (A), can still cause deafness, and therefore is not safe.