Cardiovasc Ther. 2013 Feb;31(1):2. doi: 10.1111/1755-5922.12013.
There are many different types of studies that can be conducted to provide evidence for clinical and outcomes research, including but not limited to retrospective observational analyses, case-control studies, and randomized controlled trials (RCTs). Each of these analyses has strengths and limitations, but most importantly, they all result in different types of conclusions about an intervention.
有许多不同类型的研究可以用来为临床和结局研究提供证据，包括但不限于回顾性观察分析、病例对照研究和随机对照试验（RCT）。这些分析方法各有优缺点，但最重要的是，它们都会得出关于干预措施的不同类型的结论。
