Group | No. of studies* | OR (95% CI) | Pwithin group | Pbetween group* | Pheterogeneity | I2, % | ||
---|---|---|---|---|---|---|---|---|
Total | 9 | 1.136 | 0.965 | 1.337 | 0.125 | Â | 0.036 | 62.0 |
Continent |  |  |  |  |  |  < 0.001 |  |  |
 America | 3 | 1.065 | 0.571 | 1.986 |  < 0.001 |  | 0.032 | 71.0 |
 Asia | 6 | 1.225 | 1.069 | 1.404 |  < 0.001 |  | 0.153 | 38.0 |
Screen type |  |  |  |  |  |  < 0.001 |  |  |
 TV | 3 | 1.447 | 1.122 | 1.867 | 0.004 |  | 0.221 | 33.7 |
 PC | 1 | 1.560 | 0.890 | 2.733 | 0.120 |  | – | – |
 VG | 1 | 0.920 | 0.529 | 1.598 | 0.767 |  | – | – |
 TV + VG + PC | 4 | 1.054 | 0.840 | 1.321 | 0.651 |  | 0.053 | 67 |
Age group |  |  |  |  |  |  < 0.001 |  |  |
 Adolescents | 7 | 1.135 | 0.840 | 1.321 | 0.132 |  | 0.046 | 53.2 |
 Both | 2 | 1.612 | 1.157 | 2.245 | 0.005 |  | 0.888 | 0.0 |
Setting |  |  |  |  |  |  < 0.001 |  |  |
 School | 4 | 1.129 | 0.747 | 1.705 | 0.565 |  | 0.041 | 63.6 |
 Community | 5 | 1.216 | 1.035 | 1.430 | 0.018 |  | 0.098 | 48.9 |
Sample size |  |  |  |  |  |  < 0.001 |  |  |
 1000 >  | 5 | 1.263 | 0.851 | 1.875 | 0.246 |  | 0.028 | 63.3 |
  ≥ 1000 | 4 | 1.173 | 1.022 | 1.347 | 0.023 |  | 0.171 | 40.2 |