Quality of claims, references and the presentation of risk results in medical journal advertising: a comparative study in Australia, Malaysia and the United States

Table 2 Level of evidence [44].

Level of evidence	Definition
I	Evidence obtained from a systematic review or metaanalysis
II	Evidence obtained from at least one randomized controlled trial.
III	Evidence obtained from a comparative study.
IV	Other evidence.
	-Evidence obtained from studies which did not assess clinical and public health interventions.
	- Evidence obtained from reviews.

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