Statisticians have hailed the All Blacks as the most adventurous team at a Rugby World Cup which rewarded attacking play.

World Rugby has unveiled its game analysis report from this year's tournament which culminated in New Zealand defending their title by beating Australia in the final.

Off the field it was the best attended, most viewed, most socially engaged and the most competitive of all Rugby World Cups, the report said.

On the field, two key trends emerged.