< 1/ 100); rare (≥ 1/ 10,000 to < 1/ 1,000); very rare (< 1/ 10,000), not known (cannot be estimated from the available data).
kategooriaid: väga sage (≥1/ 10); sage (≥1/ 100... < 1/ 10); aeg- ajalt (≥1/ 1000... < 1/ 100); harv (≥1/ 10000... < 1/ 1000); väga harv (< 1/ 10000), teadmata (ei saa hinnata olemasolevate andmete põhjal).