This file defines names of states (like death, poisoned etc....) that are shown in the game message window.
The first column consists of number of the effect, tested it with some effects like slow (40) and Charm Specific Creature (5) and others.
Second column is as it is said - the effect description without effect on game - just for information.
Third column consists of the strref with the name of this effect that is shown in game.
In BG2 ToB we have:
2DA V1.0
25     POISON           14017
13     DEATH            14026
134    PETRIFICATION    14127
12     DAMAGE           14027
39     SLEEP            20438
68     UNSUMMON         14065