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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Environ Int. 2016 Jan 27;92-93:611–616. doi: 10.1016/j.envint.2016.01.004

Figure 1.

Figure 1

GRADE’s approach to developing certainty ratings across a body of evidence for each outcome based on a systematic review and across outcomes (lowest quality across the outcomes critical for decision-making).

*upgrading criteria are usually applicable to observational studies only.

Adapted from “Methodological idiosyncracies, frameworks and challenges of non-pharmaceutical and nontechnical treatment interventions” (Schunemann 2013)

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