From these studies, 95% were based on type III or iv evidence (mainly descriptive studies or case reports). Only 3% were based on type II evidence and 2% on type I evidence.
从这些研究中，95%依据第三或第四类论据(主要描述相关研究和病例报道)，只有3%的研究依据第一类论据，2%依据第二类论据。
It is acknowledged that, in many areas, evidence is generally confined to case reports, observational or descriptive studies, and poorly controlled or uncontrolled studies.
我们承认，在许多领域，事实一般只局限于病例报告，观察或描述性研究，以及不好的CONTROLLED或者UNTROLLED的研究。
It is acknowledged that, in many areas, evidence is generally confined to case reports, observational or descriptive studies, and poorly controlled or uncontrolled studies.
我们承认，在许多领域，事实一般只局限于病例报告，观察或描述性研究，以及不好的CONTROLLED或者UNTROLLED的研究。
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