Wormhole Size:
Very large: All ships except for Titans and supercarriers can pass
Larger ships: Battleships, Orcas, and smaller ships can pass
Up to medium: Unplated Nestors, battlecruisers and smaller ships can pass
Only the smallest: Only frigates, destroyers, or specially fit HICs can pass

Wormhole Types:
Unknown : C1/C2/C3
Dangerous Unknown : C4/C5
Deadly Unknown : C6

+24h remains: This wormhole has not yet begun its natural cycle of decay and should last at least another day
24h-4h remains: This wormhole is beginning to decay, and probably won't last another day
4h-0h remains: This wormhole is reaching the end of its natural lifetime

%100-%50 Mass: This wormhole has not yet had its stability significantly disrupted by ships passing through it
%50-%10 Mass: This wormhole has had its stability reduced by ships passing through it, but not to a critical degree yet
%10-%0 Mass: This wormhole has had its stability critically disrupted by the mass of numerous ships passing through and is on the verge of collapse

Wormhole exit (K162) does not exist until somebody initiated warp to signature of wormhole entrance.