问题描述：
英语翻译
The life table-determined rate of freedom from progression to >60% stenosis was 94% at 4 years for asymptomatic internal carotid artery lesions that had initial peak systolic velocity less than 175 cm/s compared to 14% at 3 years for lesions that had initial peak systolic velocities less than 175cm/s compared to 14% at 3 years for lesions that had initial peak systolic velocities >175 cm/s.
The life table-determined rate of freedom from progression to >60% stenosis was 94% at 4 years for asymptomatic internal carotid artery lesions that had initial peak systolic velocity less than 175 cm/s compared to 14% at 3 years for lesions that had initial peak systolic velocities less than 175cm/s compared to 14% at 3 years for lesions that had initial peak systolic velocities >175 cm/s.
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