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Change in substance use after 2 weeks (percentagea based on first reported use).
| Characteristic | Control without game (n=11) | Case with game (n=17) |
| Average change in substance use compared to initial 100%, %a | 110 | 38 |
| Number who quit, n | 0 | 5 |
| Number who restarted, n | 2 | 1 |
aPercentage reflects the amount of substance use increase.
