另一个原因是，随着时间的推移，试图减肥的人群比例一直在增加。

Another cause is that the proportion of people who are trying to lose weight has been increasing over time.

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尽管孕妇接受抗逆转录病毒疗法的比例有所增加，但是其他基线特征并没有随着时间的推移而有所改善。

There was an increase in the proportion of women who initiated ART while pregnant but no change in other baseline characteristics over time.

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研究人员说：“28%看上去是一个很低的比例，但引起注意的是RNA随着时间推移是会降解的，因此新鲜的样本中这个数字会更高、更准确。”

Twenty-eight percent might seem like a low number, the researchers say, but it's significant given that RNA can degrade over time, so fresher samples would likely be more accurate.

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