周末死亡率也与大部分以前的时间期限一样的更高。

The weekend death rates were similarly higher in most of the previous time periods, too.

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根据美国心脏病学院(的统计)，QT间期延长的人心源性死亡的风险增高，其可解释美国每年超过四十万的死亡人数。

People with prolonged QT intervals have a higher risk of cardiac death, which accounts for more than 400,000 deaths each year in the United States, according to the American College of Cardiology.

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研究的首要观察终点为PFS，其定义为初始治疗至第一次记录疾病进展或死亡的间期。

The primary endpoint was PFS, which was defined as the interval between initial treatment and the first documentation of disease progression or death.

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