Table 3.

Uncertainties deriving from availability of published studies, based on the scale proposed by EFSA [53].

Uncertainty	Data availability (type, amount, quality)	Data variability (consistency)
Low	scarce or no data available; evidence not provided in references but rather in unpublished reports, based on observation	authors report similar conclusion
Medium	some but no complete data available, evidence provided in small number of references	authors report conclusions that vary from each other
High	solid and complete data available; strong evidence provided in multiple references	authors report conclusions that vary considerably between them