Authors/publ. year | Size of study N | Age range-mean | Life time prevalence % | 6 - 12 months prevalence % | Country |
You, et al. 2011 [2] | 6374 | 15 | 15 |
| China |
Lucassen, et al. 2011 [3] | 8000 | Secondary students |
| 20.9 | New Zeeland |
Zetterqvist, et al. 2013 [4] | 3060 | 15 - 17 |
| 35 | Sweden |
Forster, et al. 2020 [5] | 39,682 33,966 | 14 17 |
| 16 15 | USA USA |
Baetens, et al. 2020 [6] | 651 | 13 | 14.9 |
| Belgium |