Epidemiology

Question 1

Levels of evidence

Answer 1

Level I

Evidence from a systematic review or meta-analysis of all relevant RCTs (randomized controlled trial) or Practice Guideline

Level II

Evidence obtained from at least one well-designed RCT (e.g. large multi-site RCT).

Level III

CT- 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.

Question 2

What is the difference between and Systemic Review and Meta-analyis?

Answer 2

A systematic review answers a defined research question by collecting and summarizing all empirical evidence that fits pre-specified eligibility criteria. A meta-analysis is the use of a numerical, statistical method to summarize the results of these studies

Question 3

describe cohort study

Answer 3

Cohort studies are a type of medical research used to investigate the causes of disease and to establish links between risk factors and health outcomes.

Studies a group of individuals with an exposure to see if they get the disease