The tournament was played in two different stages. In the first stage, the twelve participants were divided into four groups of three teams. In the second stage, two groups were formed, one containing the winners and runners-up from all first stage groups (eight teams in total) to contest the tournament title. A second group was formed by the last placed teams of first stage groups (four teams) which played for position places (9th to 12th). All groups in both stages played a single round-robin format.