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Table 2 Details of the quality of evidence categories in GRADE

From: Advice about diet and smoking for people with or at risk of age-related macular degeneration: a cross-sectional survey of eye care professionals in the UK

GRADE Descriptor
High Further research is very unlikely to change our confidence in the estimate of effect
Moderate Research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate
Low 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
Very low Any estimate of effect is very uncertain.