Countries included in the men’s and women’s epidemiological studies
| Competition | Participating countries |
| 2014/2015 SWS | |
| Men | Argentina, Australia, Canada, England, Fiji, France, Japan, Kenya, New Zealand, Portugal, Samoa, Scotland, South Africa, USA, Wales |
| Women | Australia, Canada, China, England, Fiji, France, New Zealand, Russia, South Africa, Spain, USA |
| 2015/2016 SWS | |
| Men | Argentina, Australia, Canada, England, Fiji, France, Kenya, New Zealand, Portugal, Russia, Samoa, Scotland, South Africa, USA, Wales |
| Women | Australia, Canada, England, Fiji, France, Ireland, Japan, New Zealand, Russia, Spain, USA |
| 2016 Rio Olympics | |
| Men | Argentina, Australia, Brazil, Fiji, France, Great Britain, Japan, Kenya, New Zealand, South Africa, Spain, USA |
| Women | Australia, Brazil, Canada, Colombia, Fiji, France, Great Britain, Japan, Kenya, New Zealand, Spain, USA |
SWS, Sevens World Series.