Table 2.

Pearson correlation matrix of the variables of interest.

Variables	Insomnia	Depression	Anxiety	Stress	Gaming disorder	Quality of life (adolescent report)	Quality of life (parent report)
Insomniaa	—	0.33**	0.34**	0.24**	0.48**	−0.26**	−0.19**
Depressionb		—	0.57**	0.28*	0.23**	−0.38**	−0.28**
Anxietyc			—	0.22**	0.20**	−0.33**	−0.22**
Stressd				—	0.21**	−0.40**	0.30**
Gaming disordere					—	−0.35**	0.30**
Quality of life (adolescent report) f						—	0.71**
Quality of life (Parent report) g							—

* p < 0.05; ** p < 0.01.

^aAssessed using Insomnia Severity Index (ISI).

^bAssessed using Depression, Anxiety and Stress Scale (DASS-21).

^cAssessed using Depression, Anxiety and Stress Scale (DASS-21).

^dAssessed using Depression, Anxiety and Stress Scale (DASS-21).

^eAssessed using Internet Gaming Disorder Scale-Short Form.

^fAssessed using PedsQL^TM 4.0 SF15.

^gAssessed using PedsQL^TM 4.0 SF15.