Of the available studies, 29 were cohort studies, 69 case-control studies, and 4 randomized clinical trials.

现有的研究包括29个队列研究，69个病例对照研究以及4个随机临床试验。

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Objective This paper presents a statistical method of familial correlation on family data from case-control studies.

目的提出一种分析病例对照家系资料家庭相关的统计方法。

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Objective To introduce the approaches for estimating gene-environment interaction based on partial case-control studies.

目的介绍不完全病例对照研究中基因与环境交互作用的估计方法。

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In addition, case-control studies, such as the large INTERHEART study conducted in 52 countries, have provided valuable information.

FORBES: Do Smoking Bans Really Save Lives? If So, Whose?

The Danish study is prospective in nature, which distinguishes it from most other studies on the health effects of cell phone use, which were case-control studies and enrolled subjects diagnosed with brain tumors and a comparison group of subjects who were free of brain tumors in order to compare reported cell phone usage in the two groups.

FORBES: Do Cell Phones Cause Brain Cancer? The Diehards Cling Desperately To Opinion