Честотата се определя като: много чести (≥1/ 10), чести (≥1/ 100 < 1/ 10), нечести (≥1/ 1 000 < 1/ 100).
Frequencies are defined as: very common (≥ 1/ 10), common (≥ 1/ 100, < 1/ 10), uncommon (≥ 1/ 1,000, < 1/ 100).