Честотите са дефинирани като: много чести (≥ 1/ 10), чести (≥ 1/ 100, < 1/ 10), нечести (≥ 1/ 1000, < 1/ 100) редки (≥ 1/ 10 000, < 1/ 1000) и много редки (< 1/ 10 000 включително отделни случаи).
Frequencies are defined as: very common (≥ 1/ 10), common (≥ 1/ 100, < 1/ 10), uncommon (≥ 1/ 1,000, < 1/ 100), rare (≥ 1/ 10,000, < 1/ 1000) and very rare (< 1/ 10,000 including isolated reports).