In the stats of the spectating screen of CSGO, I've found myself wondering what is the ADR column.
It looks like some kind of ratio on 1000, but have no idea what it calculates.
ADR stands for Average Damage per Round
As K/D ratio is statistical representation used to measure how good you are in free for all game mods,the ADR is used to represent how useful you are in the team games.
Also Overkill damage is not counted in ADR.
In case you wonder HS% is "Head Shot percentage" and OBJ is number of objective you have done.