Their work follows a group of individuals over time and looks at how different factors contribute to different outcomes-in this case, the development of cancer.

他们在一段时间内跟踪一组个体并观察不同的因素导致了什么样的不同结果——在这个研究中，就是癌症的发生。

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Results: By comparison, patient appears the duration of psychological factors is better than control group, time shortens greatly, a statistically significant difference.

结果：经比较，患者出现心理因素的持续时间实验组也是优于对照组，时间大大缩短，差异有统计学意义。

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These are the gold standard randomized control trials or intervention studies, in which a control group consuming soda is monitored for weight gain over time against a group which stops drinking soda (and all other dietary and lifestyle factors are controlled for).

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