因为测量结果的指标尝采用生命质量效用的测量结果，即质量调整生命年（quality-adjusted of life years,QALYs）,而不只是延长生存期限。这是一种表示人的生命质量改善的指标，研究慢性病多用此法。
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quality-adjusted life of years 常用的效用指标是生命质量调整年
The outcome of interest was expected quality-adjusted life-years (QALY).
考察的目标是生活质量调整后的生存时间。
Our major finding was that the average quality-adjusted life years (QALY) of Vitamin E-supplemented individuals was 0.30 less than that of untreated people.
我们的核心发现是补充维他命e的个人的平均QALY比没有补充维他命e的个人的平均QALY要少0.30。
The effect of a disease - or a condition like obesity - can be tallied by a measure called quality-adjusted life years lost.
VOA: standard.2010.08.10
Black women,in particular, had higher rates of obesity throughout the 16 years studied, and they paid the biggest price in terms of quality-adjusted years of life lost.
VOA: standard.2010.08.10
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