How can I tell what "level of evidence" a research article/study is?

Question:

How can I tell what "level of evidence" a research article/study is?

Levels Of Evidence:

A "level of evidence" is a heuristic, or rule of thumb, rather than an exact metric. It takes into account the relative strengths and weaknesses of different types of evidence and assigns a number based on that. The lower the number, the stronger the evidence. Measures of evidence level are slightly different in different parts of the world.

Answer and Explanation:

Consider starting with weak evidence and asking what would be stronger evidence. Anecdotes and witness testimony are considered very weak forms of...

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