摘要
本科於1996年3月間，針對國中一、二年級學生(男105名、女94名)，利用(1)問卷調查 ; (2)音聲檢查含最長呼氣時間(maximum breathing time, MBT)、最長發聲時間(maximum phonation time,MPT)及說話基頻(speaking fundamental frequency) ; (3)肺活量(vital capacity)檢查及(4)耳鼻喉局部檢查等，觀察及分析其變聲前後之發聲狀態、聲帶外觀及其自覺症狀，並獲得如下之結果：(1)國一男生78.2%(25/32)、國二男生94.5%(68/73)已進入戀聲期;(2)58.5%(55/94)男生知悉其變聲之年齡;而女生知悉其變聲之年齡者只有5名，與男生有明顯差異。90%已變聲之男生，其年齡主要介於11到14歲間，平均為12歲8個月;(3)變聲期出現之各種明顯自覺症狀，以高音發不出者居首;(4)變聲前，男生平均說話基頻為250Hz，變聲後為130Hz;(5)音聲檢查之結果：男生平均最長發聲時間為21.7秒，其中異常者(小於14秒)6名(5.7%);女生為19.0秒，無異常者。平均最長呼氣時間(MBT)男生為36秒，女生為31秒，變聲前後並無夕大差異;(6)肺活量檢查：男生肺活量(VC)平均為3375Ml，女生平均為2808Ml。呼氣流率近似值( phonation quotient = VC/MPT)男生平均為155ml/sec，女生平均為148ml/sec，變聲前後並無多大差異;(7)喉局部檢查所見：聲帶充血泛紅者22名(男17名、女5名)，有泡沫現象者(bubbling effect)2名(無女生);此外，並無聲帶異常者。(中耳醫誌 1997;32:404-411)
並列摘要
We studied the voice mutation in juvenile group in Taipei city. The sample group consisted of 105 boys and 94 girls who were students of the first and second grades in a junior high school. In this report questionnaire, phonation, vital capacity and local findings of the ears, nose and throat were studied. The results are as follows: 78.2% of the first grade boys and 94.5% of the second grade boys reached the mutation. 58.5% of boys were aware of their voice mutation, while only 5.3% of girls noticed that. More then 90% of boys presented voice mutation at the ages between 11 and 14, with mean age of 12 years and 8 months. Being unable to make high pitch voice is the most common symptom of boys during mutational stage. The average speaking fundamental frequencies of boys are 250 Hz in permutation stage and 130 Hz in post-mutation stage. Six (5.7%) boys had abnormal maximum phonation time (＜14 second).