在苏格兰关于卵巢癌死亡率的相应研究也证实了这点。
Comparative studies of ovarian cancer mortality in Scotland also indicate this.
每天睡眠时间大于七小时或小于五小时的人，死亡率相应增高。
Sleeping more than seven hours or less than five increased mortality risk.
所以他们有很多更佳的行为方式，而这可以部分地解释为什么相应的死亡率较低。
So they have a range of better behaviours that may partly explain their lower mortality risk.
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