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问题: 请帮忙翻译

Upper intestinal ulcers were found in only one-half of one percent of the famotidine group
麻烦翻译一下
重点是 one-half of one percent of

解答:

one-half of one percent of:0.5% (百分之零点五,或千分之五)

Upper intestinal ulcers were found in only one-half of one percent of the famotidine group
法莫替丁组中发现肠道溃疡的比率仅有千分之五。