各位大侠，文献上看到这么一段，什么意思呢？

                                                                                                                                                [size=10.000000pt]Warfarin therapy had the lowest discounted quality-adjusted lifeyears at 4.55, followed by dabigatran at 4.64 and LAA occlusion at 4.68. The average discounted lifetime cost was $21 429for a patient taking warfarin, $25760 for a patient taking dabigatran, and $27003 for LAA occlusion.
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[size=10.000000pt]质量调整寿命年我知道，但是discounted就不明白了。
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[size=10.000000pt]谢谢谢谢！