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Background and Objectives:Vocal polyps and nodules are representative chronic benign laryngeal diseases, and voice overuse, misuse, and abuse are felt by most authors to be the primary causative factors. Treatment options for vocal polyps and nodules in determine the changes in voice quality of a group of patients diagnosed with vocal polyp or vocal nodule before and after micro-laryngeal surgery. Materials and Method:The following patients groups were studied prior to and 2 weks after surgery:thirty-eight males, ages 27 to 62, and twenty five females, ages 23 to 47, with vocal polyp;three males, ages 29 to 38, and twenty eight females, ages 21 to 49, with vocal nodules. Voice recordings of the first sentence of a standardized paragraph Visi-Pitch I program. For the sentence, mean speaking fundamental frequency (F0), mean jitter and mean shimmer were analyzed. Results:For the polyps, male patients showed decreased mean F0 (119.28 Hz), compared to the preoperative value (125.86 Hz) (p<0.05), and female patients showed increased mean F0 (197.52 Hz), compared to the preoperative value (190.07 Hz) (p=0.06)value (p<0.01). For the nodules, male patients showed decreased mean F0 (136.24 Hz) compared to the preoperative value (138.68 Hz), and female patients showed increased mean F0 (199.98 Hz) compared to the preoperative value (192.61 Hz) (p<0.05). Mean jitter and shimer improved in both males and females 2 weks after the surgery compared to their preoperative value. Conclusion:mean F0 and reduced level of vocal perturbation. And, mean F0 showed diferent changes between males and female. Further research needs to be pursued on what this changes of mean F0 mean. (Korean J Otolaryngol 203 ;46 :147-50)