Table 2.

Several unidimensional IGD-20 fit statistics

Variable	Eigenvalues	% Variance	Domains	Loading	H2	GF	Normed MSA	I-UniCo	ECV
1	4.08	68.07	Tolerance	.89	.98	.84	.87	.98	.89
2	0.63	10.49	Withdrawal	.89	.79	.86	.89	1	.93
3	0.52	8.68	Salience	.87	.76	.82	.89	.99	.84
4	0.30	5.05	Relapse	.86	.74	.85	.91	1	.98
5	0.27	4.48	Conflict	.74	.54	.71	.94	1	.97
6	0.19	3.23	Mood modification	.68	46	.58	.94	.98	1

Note. IGD-20 – Internet Gaming Disorder-20; GF – general factor rotated loading matrix (exploratory bifactor model); H2 – communalities; normed MSA – measure of sampling adequacy; values of MSA below .50 suggest that the item does not measure the same domain as the remaining items in the pool, so it should be removed; I-UniCo – item unidimensional congruence; a value of UniCo larger than .95 suggests that data can be treated as essentially unidimensional; ECV – explained common variance; a value of ECV larger than .85 suggests that data can be treated as essentially unidimensional.