The modern format for the World Championship features 8 teams in the championship group, and the remaining teams in the National Team World Cup. The teams in the championship play a preliminary round, then the eight teams play in the playoff medal round and the winning team is crowned World Champion.
As of 2012, 18 tournaments have been staged. Four nations have won a gold medal at the World Championships and a total of eight have won medals. United States has won 17 medals including 14 gold, the most of any nation. United States captured a medal in all but one tournament they entered.