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Table 1 European commission nomenclature for communicating frequency of adverse effects of drugs

From: Words or numbers? Communicating risk of adverse effects in written consumer health information: a systematic review and meta-analysis

Description Frequency interval
Very common (≥1/10)
Common (≥1/100 to <1/10)
Uncommon (≥1/1000 to <1/100)
Rare (≥1/10000 to <1/1000)
Very rare (<1/10000)
Not known cannot be estimated from the available data