MMORPG Other role-playing First-person shooter (FPS) Other shooter Action-adventure
  Engaged (lnOR) Problem play (B) Engaged (lnOR) Problem play (B) Engaged (lnOR) Problem play (B) Engaged (lnOR) Problem play (B) Engaged (lnOR) Problem play (B)
Age at interview -1.30 *** 0.50 *** -0.74 *** -0.04   -0.61 *** -0.12   0.30 * -0.14 + -0.11   -0.12 +
Age (linear) 2.99 *** -0.61 *** 0.83 *** -0.07 *** 2.00 *** 0.08 ** 0.21 *** 0.08 *** 0.88 *** -0.08 ***
Age (quadratic) -0.61 *** -0.07   -0.54 *** -0.02   -0.47 *** -0.05 ** -0.01   -0.03 + -0.39 *** -0.03 *
Caffeine consumption 0.10   0.03   -0.06   0.01   0.06   -0.03   -0.02   0.02   0.05   0.03 *
Sugar consumption 0.47 *** 0.06   0.25 *** -0.04 + 0.03   0.03   0.17 ** -0.04 + 0.08   -0.03  
Sensation-seeking -0.20   0.06   -0.29 ** 0.18 ** 0.04   0.28 *** -0.13   0.25 *** <.01   0.24 ***
Sociability 0.65 *** -0.18   0.34 ** -0.11   0.04   -0.10   0.10   -0.02   0.03   -0.06  
Shyness 0.19   -0.06   0.12   -0.05   -0.23 * 0.05   -0.18   -0.02   -0.09   0.02  
Live away from home <.01   -0.02   0.06   -0.10 * -0.73 *** -0.10 * -0.61 *** 0.08   -0.25 * -0.07 +
Higher education -0.32 + -0.05   0.06   0.04   -0.03   0.01   -0.12   -0.19 *** 0.09   0.03  
Part-time job -0.18   0.03   -0.23 * -0.09 * -0.12   -0.05   0.07   0.04   -0.09   -0.03  
Full-time job 0.14   -0.18   0.32 * -0.04   0.53 *** -0.14 ** 0.50 *** 0.04   0.17   0.02  
Off-books job 0.22   0.11   -0.02   -0.07   0.26 * <.01   0.31 * -0.08   0.10   -0.06  
Gender: female -1.26 *** -0.19   -0.71 *** 0.09   -2.67 *** -0.22   -2.00 *** -0.10   -0.57 ** -0.03  
Race: Black -2.25 *** -1.04 ** -0.82 ** -0.08   -0.52 + -0.03   -0.08   -0.07   -0.28   -0.15  
Race: Latino -0.99 * -0.05   -0.02   -0.01   0.62 * -0.20   0.79 * -0.12   0.88 *** -0.24  
Race: Asian 0.81 + -0.16   0.10   0.32 + 0.38   0.11   -0.11   0.14   -0.52 + 0.08  
Race: Other -0.40   -0.93 * 0.58 + -0.57 ** -0.02   -0.75 ** 0.81 + -0.74 ** 0.50   -0.93 ***
Constant -4.54 *** 3.34 *** 0.62 + 1.83 *** 1.70 *** 2.24 *** -0.13   1.73 *** 0.75 * 2.10 ***
Intra-class correlation 0.80   0.79   0.63   0.83   0.59   0.84   0.73   0.83   0.58   0.83  
Model fit Wald χ2 (18df) 504.0 *** 123.5 *** 829.8 *** 108.2 *** 1493.5 *** 69.0 *** 153.3 *** 72.5 *** 897.4 *** 126.3 ***
R-squared overall     0.10       0.05       0.07       0.04       0.06  
Table 1: Multi-level models predicting engagement with genre and problem play while engaged with genre from study variables (part 1).
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