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