Table 2.

Average scores (and standard deviation) for the different scales measuring psychopathological co-morbidity of normal internet users compared with problematic internet users

	Normal internet users (N = 173)	Problematic internet users (N = 58)	p (Mann–Whitney U test)
Athens Insomnia Scale	6.3 (4.5)	8.8 (4.8)	<0.001*
Beck Depression Inventory	18.3 (12.7)	27.4 (11.9)	<0.001*
State-trait Anxiety Inventory (State)	49.3 (12.1)	54.0 (12.0)	0.013
State-trait Anxiety Inventory (Trait)	53.9 (11.0)	61.8 (8.5)	<0.001*
Adult ADHD Self-report Scale part A	1.8 (1.5)	3.1 (1.6)	<0.001*
Adult ADHD Self-report Scale part B	1.8 (2.3)	3.5 (2.5)	<0.001*
Autism Spectrum Quotient	21.6 (7.1)	25.9 (7.1)	<0.001*
Obsessive-compulsive Inventory	36.3 (31.7)	63.2 (34.1)	<0.001*
Liebowitz Social Anxiety Scale	54.0 (33.9)	71.4 (32.2)	<0.001*
Alcohol Use Disorders Identification Test	3.2 (4.4)	4.3 (5.5)	0.357
Barratt Impulsiveness Scale	63.5 (8.2)	67.4 (8.2)	0.004*

P-values represent the significance of uneven distribution between normal and problematic internet users on each of the scale scores, according to the Mann–Whitney U test

*Significant after Bonferroni correction