Methods We acquired the different parameter values by acoustic measurement software when voicing the vowel [a] and [i] in four phases(before surgery and the first,third,fifth day after surgery),proceed the statistical analysis(GLM and PCA).

• 方法 用声学软件对 31名声带息肉或小结患者在术前及术后第 1、3、5天分别测试并记录在发元音 [i]及[a]时的基频微扰 (Jitter)、幅度微扰 (Shimmer)、谐噪比 (HNR)值 ,并进行多因素方差分析及主成分分析。