From the analysis details, it doesn't look like there were many factors that were considered. There was gender, demographic distribution and platform, however the demographics were extremely narrow "The mean age is 24.5, with a standard deviation of 7.33".
So the authors can tell how many were on PC, for example, but there's no indication of how many were on, for example, an MMORPG, as opposed to a solo game. Nor does it clearly factor in the considerable number of gamers that are older than around 30 years old. You may find this interesting https://headphonesaddict.com/pc-gaming-statistics/