Real-time strategy Other strategy Team sports sim Motion-ctrl sports Fighting
  Engaged (lnOR) Problem play (B) Engaged (lnOR) Avg. prob use (B) Engaged (lnOR) Problem play (B) Engaged (lnOR) Problem play (B) Engaged (lnOR) Problem play (B)
Age at interview -0.16   -0.28 + -0.34 * -0.06   0.36 ** -0.13 + -1.74 *** 0.35 + -0.05   -0.14 *
Age (linear) 1.71 *** -0.33 *** 0.41 *** -0.05   0.74 *** 0.09 *** 2.52 *** -0.25   0.52 *** -0.04 *
Age (quadratic) -1.00 *** 0.15 *** -0.39 *** -0.05   -0.25 *** -0.04 * 0.41 ** -0.06   -0.56 *** <.01  
Caffeine consumption 0.02   <.01   0.04   <.01   0.15 ** 0.01   0.24 * -0.07   0.04   0.01  
Sugar consumption 0.38 *** -0.06   0.07   0.04   0.12 + -0.14 *** 0.06   0.02   0.28 *** -0.02  
Sensation-seeking -0.45 * 0.19   -0.27 + 0.07   -0.14   0.27 ** -0.09   0.39 ** -0.17   0.20 **
Sociability 0.40 * -0.01   0.08   0.07   0.22   -0.13   -0.03   -0.26 * 0.32 * <.01  
Shyness 0.16   -0.15   0.05   <.01   -0.24 + 0.04   -0.06   -0.29 * -0.05   <.01  
Live away from home -0.39 + -0.14   0.09   -0.03   -0.06   -0.13 * -0.19   -0.03   -0.13   0.03  
Higher education -0.38 * 0.09   -0.33 * -0.07   -0.18   0.04   0.25   -0.01   -0.51 *** 0.02  
Part-time job 0.45 ** -0.09   -0.14   -0.03   -0.26 * -0.08 + 0.17   -0.27 ** -0.13   -0.01  
Full-time job 0.88 *** 0.04   0.31 + <.01   -0.11   -0.03   0.70 * -0.19 * 0.08   0.05  
Off-books job -0.04   0.09   0.04   -0.18 * 0.31 * 0.12 * 0.24   -0.09   -0.15   0.05  
Gender: female -2.43 *** 0.11   -0.51 + -0.09   -2.31 *** -0.82 *** -0.13   0.06   -2.24 *** -0.29 *
Race: Black -1.28 * 0.25   -0.88 * 0.20   0.04   -0.24   -1.51 * -0.77   0.65 + 0.08  
Race: Latino -0.47   -0.09   0.58   -0.06   0.23   -0.10   1.00 + 0.29   1.44 *** -0.12  
Race: Asian 2.92 *** 0.59 + 0.99 * 0.62 * -0.59   0.31   1.24 * 0.95 * -0.05   0.19  
Race: Other 1.00 + -0.23   1.17 * -0.24   0.49   -0.60 * 0.68   -0.56   1.75 *** -0.58 **
Constant -2.74 *** 1.46 *** -3.72 *** 1.67 *** 0.05   2.66 *** -9.40 *** 1.62 *** 2.68 *** 1.91 ***
Intra-class correlation 0.77   0.85   0.74   0.86   0.72   0.85   0.75   0.91   0.71   0.85  
Model fit Wald χ2 (18 df) 438.2 *** 60.4 *** 162.3 *** 38.0 ** 416.4 *** 88.7 *** 276.0 *** 56.0 *** 623.8 *** 49.2 ***
R-squared overall     0.12       0.06       0.11       0.23       0.05  
Coefficients for multi-level binary logistic (predicting play of any game within the genre) and linear regression (predicting average problem play of all games reported within that genre for each year) models significant at + p < .10, * p < .05, ** p < .01, *** p < .001
Table 2: Multi-level models predicting engagement with genre and problem play while engaged with genre from study variables (part 2).