A score given to a species based on its conservation score. The scores are used to create the Species Quality Index (SQI) score for a sample.
0 = Not native. Not all of these are listed as not native in the status review: some are given no score, but the text says that they are thought not to be native. It is not always possible to tell whether a species is native or whether the reviewer thought it is native.
1 = Species that are not rare or scarce. Includes those that are New to Britain.
4 = Scarce species that are not listed as threatened under post-1994 or post-2001 IUCN criteria. Rare species listed as RDB K or RDB I under pre-1994 criteria. Notable species (Na, Nb, and Notable).
8 = Rare species that are not listed as threatened under post-1994 or post-2001 IUCN criteria. Rare or scarce species listed as Vulnerable under post-1994 or post-2001 criteria. Rare species listed as RDB 2 or RDB 3 under pre-1994 criteria.
16 = Rare or scarce species listed as Endangered under post-1994 or post-2001 criteria. Rare species listed as RDB 1 under pre-1994 criteria.
32 = Rare or scarce species listed as Critically Endangered, Critically Endangered (Possibly Extinct), Regionally Extinct, Extinct, or Extinct in the Wild under post-1994 or post-2001 criteria.