"In their article in Addictive Behaviors, a team from the University of California in the US looked at 27 studies on IGD published between 1998 and 2016, to determine whether the disorder is indeed becoming more prevalent. The average across all years was 4.7%, and the results showed it has not increased significantly in the last two decades."

I have not read the article in Addictive Behaviors  yet but that is a surprising finding.  It makes me wonder about the screening methods/conceptualization of the problem used  in the various studies and whether they captured some of the changes in technology that arguably make modern games more "addictive" (in game currency, games are infinite, etc.).