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91% vs 63.64%), and mucosal wave (81.82% vs 54.55%). A significant improvement was observed in VHI-30 scores, GRBAS scores, and acoustic parameters ( .05). The size of lesions had an effect on the GRBAS scores ( .001) but not on VHI-30 scores and objective acoustic parameters ( .05). Other factors we tested did not affect voice outcomes. Potassium titanyl phosphate laser treatment can effectively reduce the lesion area of vocal polyps and improve the voice quality. The presence of small lesions seems to predict good sub