是一项观察性研究 in English translation

• is an observational study
• was an observational study

Examples of using 是一项观察性研究 in Chinese and their translations into English

因为这是一项观察性研究，我们不确定这些化学物质是青春期早期的原因。
Because it's an observational study, we don't know for sure that the chemicals are the cause of earlier puberty.

虽然是一项观察性研究，但对于喝咖啡的人来说，这仍然是个好消息。
Although an observational study, it is still good news for coffee drinkers.

然而，虽然这项研究是一项观察性研究，但两者之间的绝对联系无法确定。
However, although the study is an observation study an absolute link cannot be identified with certainty.

虽然这是一项观察性研究，研究人员不能确定因果关系，但他们指出了一些可能的机制来解释这些结果。
Though this is an observational study, and the researchers cannot establish causality, they do point to some potential mechanisms that could explain the results.

这是一项观察性研究，这意味着，它不能证明是抗抑郁药物导致了风险增加；.
The study was observational, which means it can't prove that antidepressants caused the increased risk;

虽然这是一项观察性研究，研究人员不能确定因果关系，但他们指出了一些可能的机制来解释这些结果。
Although this is an observational study, and the researchers cannot establish causality, they do point to some potential mechanisms that could explain the results.

这是一项观察性研究，因此无法确定原因，作者指出了一些限制。
This is an observational study and, as such, could not establish the cause, and the authors point out some limitations.

这项研究包括316名患者，其中130名儿童，这是是一项观察性研究，而不是随机试验。
The study-- which included 316 patients, including 130 children-- was an observational study, not a randomized trial with a control group.

如何（研究设计）：这是一项观察性研究。
How(Study Design): This was a case-control observational study.

如何（研究设计）：这是一项观察性研究。
How(Study Design): This was a population-representative survey.

如何研究（研究设计）：这是一项观察性研究。
How(Study Design): This was a case-control observational study.

如何研究（研究设计）：这是一项观察性研究。
How(Study Design): This was a population-representative survey.

此外，这是一项观察性研究，而不是随机对照试验。
Moreover, this was an observational, not experimental, study.

但这仍然是一项观察性研究，因此无法证明水果和蔬菜摄入会引起钙化斑块风险的变化，他说.
But this was still an observational study, so it can't prove that fruit and vegetable intake caused changes in calcified plaque risk, he said.

对于导致智商下降的确切原因，我们还不得而知，因为这只是一项观察性研究，但是，此前的另一项动物实验已经发现：.
The exact cause for the reduction in IQ is still unknown, as this was only an observational study, but previous animal research has found that.

研究设计：这是一项观察性研究。
Design: This is an observational study.

研究设计：这是一项观察性研究。
Study Design: This is an observational study.

这是一项观察性研究，不是干预研究。
This was an observational study, not interventional.

这是一项观察性研究，不是干预研究。
This is an observational study, not an intervention study..

研究设计：这是一项观察性研究。
Study Design: This was an observational study.