Table 10.

Comparison of explanations for quality of evidence ratings.

Rating	GRADE approach	Navigation Guide approach	OHAT approach	QoE-SPEO approach
High quality (or confidence)	Further research is very unlikely to change our confidence in the estimate of effect.	Unclear	The true effect is highly likely to be reflected in the apparent relationship.	Further research is very unlikely to change our confidence in the estimate of prevalence.
Moderate quality	Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate.	Unclear	The true effect may be reflected in the apparent relationship.	Further research is likely to have an important impact on our confidence in the estimate of prevalence and may change the estimate.
Low quality	Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate.	Unclear	The true effect may be different from the apparent relationship.	Further research is very likely to have an important impact on our confidence in the estimate of prevalence and is likely to change the estimate.
Very low quality	We are very uncertain about the estimate of effect.	Not applicable	The true effect is highly likely to be different from the apparent relationship.	We are very uncertain about the estimate of prevalence.

Footnotes:

GRADE – Grading of Recommendations Assessment, Development and Evaluation; OHAT - Office of Health Assessment and Translation; QoE-SPEO – Quality of Evidence in Studies estimating Prevalence of Exposure to Occupational risk factors.