Group | No. of studies* | OR (95% CI) | P within group | P between group * | P heterogeneity | I2, % |
---|---|---|---|---|---|---|
Total | 44 | 1.273 1.166 1.390 | < 0.001 |  | < 0.001 | 82.1 |
Continent |  |  |  | < 0.001 |  |  |
 America | 11 | 1.115 1.002 1.241 | 0.046 |  | 0.083 | 39.9 |
 Europe | 10 | 1.080 0.966 1.208 | 0.276 |  | 0.002 | 66.2 |
 Asia | 11 | 2.014 1.450 2.798 | < 0.001 |  | < 0.001 | 90.9 |
 Oceania | 8 | 1.099 0.927 1.304 | 0.278 |  | 0.056 | 49.1 |
 Africa | 4 | 1.646 1.018 2.660 | 0.042 |  | < 0.001 | 86.9 |
Screen type |  |  |  | < 0.001 |  |  |
 TV | 16 | 1.813 1.420 2.315 | < 0.001 |  | < 0.001 | 86.7 |
 PC | 3 | 1.467 0.950 2.265 | 0.509 |  | 0.159 | 45.7 |
 VG | 5 | 1.114 0.808 1.536 | 0.084 |  | 0.014 | 67.9 |
 TV + VG | 5 | 1.094 0.959 1.248 | 0.184 |  | 0.107 | 47.5 |
 VG + PC | 2 | 1.106 1.030 1.187 | 0.005 |  | 0.612 | 0 |
 TV + VG + PC | 13 | 1.068 0.974 1.172 | 0.163 |  | 0.002 | 60.7 |
Age group |  |  |  | < 0.001 |  |  |
  < 15 | 23 | 1.375 1.131 1.672 | 0.001 |  | < 0.001 | 81.9 |
  ≥ 15 | 6 | 1.470 1.076 2.008 | 0.016 |  | < 0.001 | 82.8 |
 Both | 15 | 1.126 1.032 1.228 | 0.008 |  | < 0.001 | 76.4 |
Setting |  |  |  | < 0.001 |  |  |
 School | 31 | 1.405 1.228 1.608 | < 0.001 |  | < 0.001 | 86.6 |
 Community | 13 | 1.109 1.040 1.182 | 0.002 |  | 0.229 | 21.2 |
Obesity status |  |  |  | < 0.001 |  |  |
 Obesity | 11 | 1.109 0.964 1.275 | 0.150 |  | 0.001 | 67.0 |
 Overweight | 9 | 1.567 1.282 1.916 | < 0.001 |  | < 0.001 | 84.1 |
 Overweight/ obesity | 24 | 1.271 1.105 1.463 | 0.001 |  | < 0.001 | 87 |
Sample size |  |  |  | < 0.001 |  |  |
 1000 > | 11 | 2.024 1.303 3.144 | 0.002 |  | < 0.001 | 90.9 |
 1000–5000 | 27 | 1.121 1.049 1.198 | 0.001 |  | < 0.001 | 59.9 |
  ≥ 5000 | 6 | 1.323 1.017 1.722 | 0.037 |  | 0.001 | 75.7 |
Study quality * |  |  |  | < 0.001 |  |  |
 Low | 0 | – |  | – | – | – |
 Moderate | 31 | 1.259 1.085 1.461 | < 0.001 |  | < 0.001 | 80.3 |
 High | 13 | 1.282 1.146 1.435 | 0.002 |  | < 0.001 | 84.4 |
Adjusted covariates |  |  |  | < 0.001 |  |  |
 Age, sex, nationality, SES | 7 | 1.239 1.116 1.377 | < 0.001 |  | 0.586 | 0 |
 Age, sex, nationality, SES, other demographic variables | 14 | 1.454 1.251 1.690 | < 0.001 |  | < 0.001 | 87.3 |
 Age, sex, nationality, SES, other demographic variables, dietary habits | 23 | 1.091 0.982 1.212 | 0.107 |  | < 0.001 | 64.8 |