研究人员使用了疾病控制中心的生长曲线表，他们把小孩分成了三个组。
Using growth charts from the Centers for Disease Control and Prevention, the researchers lumped kids into one of three groups.
基于收集的数据，研究员绘制了一张表，类似于生长曲线，根据一个人的年龄，性别和步速推测其生命期。
Based on the data, the researchers created a chart, much like a growth curve, which estimated life expectancy based on a person's age, gender and walking speed.
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