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。

youdao

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。

youdao