Честотите са дефинирани като: чести (≥1/ 100 до < 1/ 10), нечести (≥1/ 1 000 до < 1/ 100) и редки (< 1/ 1 000).
Frequencies are defined as: common (≥ 1/ 100 to < 1/ 10), uncommon (≥ 1/ 1,000 to < 1/ 100) and rare (< 1/ 1,000).