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Council for International Organisations of Medical Sciences definitions are as follows which can be easily communicated to the lay person
| Term | n | Colloquial |
|---|---|---|
| Very common | 1/1 to 1/10 | A person in family |
| Common | 1/10 to 1/100 | A person in street |
| Uncommon | 1/100 to 1/1000 | A person in village |
| Rare | 1/1000 to 1/10000 | A person in a small town |
| Very rare | Less than 1/10000 | A person in a large town |
