Frequencies are defined as: very common (> 1/ 10), common (> 1/ 100, ≤ 1/ 10), uncommon (> 1/ 1,000, ≤ 1/ 100), rare (≤ 1/ 1,000), not known (cannot be estimated from the available data).
Esinemissagedus on defineeritud järgmiselt: väga sage (> 1/ 10), sage (> 1/ 100, ≤1/ 10), aeg- ajalt (> 1/ 1000, ≤1/ 100), harv (≤1/ 1000), teadmata (ei saa hinnata olemasolevate andmete alusel).