Table 5.

Summary of the hierarchical regression analysis for the variables that contributing to the severity of internet gaming disorder

I-GUESS score	Effects of adverse childhood experiences on internet gaming addiction severity				Effects of adverse childhood experiences and stress on internet gaming addiction severity
	B	S.E.	β	95% C.I.	B	S.E.	β	95% C.I.
Control variable
Constant	5.738	0.438		[ 4.879, 6.596 ]	5.309	0.427		[4.472, 6.146]
Age in years	−0.103	0.028	−0.066***	[−0.158, 0.047]	−0.203	0.028	−0.129***	[−0.258, 0.147]
Gender (0 = Male, 1 = Female)	−2.112	0.119	−0.297***	[−2.345, 1.879]	−2.215	0.116	−0.312***	[−2.442, 1.987]
Parents' attitude toward internet/smartphone use	0.049	0.046	0.018	[−0.041,0.140]	0.065	0.045	0.023	[−0.024, 0.153]
Number of preventive education experiences about internet/smartphone addiction	−0.109	0.032	−0.054***	[−0.172, 0.046]	−0.093	0.031	−0.046***	[−0.154, −0.03]
Number of cohabitants	0.065	0.066	0.016	[−0.065,0.195 ]	0.012	0.065	0.003	[−0.115, 0.140]
Economic status	0.234	0.073	0.054***	[ 0.090,0.378 ]	0.121	0.072	0.028*	[−0.020, 0.262]
Academic achievement	0.419	0.059	0.127***	[ 0.303,0.535 ]	0.321	0.058	0.097***	[ 0.207, 0.434]
Independent variable
Adverse childhood experiences	0.510	0.056	0.148***	[ 0.401,0.620 ]	0.328	0.056	0.095***	[0.219, 0.437]
Mediator
Stress scale score					0.127	0.009	0.249***	[0.109, 0.144]
Model
R 2	0.140				0.189
adj R 2	0.138				0.187
F-value	68.283				86.614
P	0.00				0.00

Note: 1) B – unstandardized coefficients; 2) *P < 0.05, **P < 0.01, ***P < 0.001; 3) S.E. – standard error; 3) C.I. – confidence interval.