Respuesta :
Answer:I
Step-by-step explanation:
Level I
Evidence from a systematic review or meta-analysis of all relevant RCTs (randomized controlled trial) or evidence-based clinical practice guidelines based on systematic reviews of RCTs or three or more RCTs of good quality that have similar results.
Level II
Evidence obtained from at least one well-designed RCT (e.g. large multi-site RCT).
Level III
Evidence obtained from well-designed controlled trials without randomization (i.e. quasi-experimental).
Level IV
Evidence from well-designed case-control or cohort studies.
Level V
Evidence from systematic reviews of descriptive and qualitative studies (meta-synthesis).
Level VI
Evidence from a single descriptive or qualitative study.
Level VII
Evidence from the opinion of authorities and/or reports of expert committees.
