Oxford Centre for EBM Levels of Evidence
Level Therapy/Prevention,Aetiology/Harm
等级 治疗/预防，病因学/危害
1a Systematic review of RCTs 随机对照的系统评价
1b Randomized controlled trial(RCT) 随机对照
1c "ALL-or-none" 全或无病案研究
2a Systematic review of cohort studies 队列研究的系统评价
2b Cohort study or poor RCT 队列研究或较差随机对研究
2c "Outcomes" research;Ecological studies “结果”研究；生态学研究
3a Systematic review of case-control studies 病例对照研究的系统评价
3b Systematic review of case-control studies 病例对照研究
4 Case series 单个病例系列研究
5 Expert opinion without critical appraisal,or based on physiology,bench research or "first principles" 未经明确讨论或基于生理学、实验室研究或“第一原则”的专家意见
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