Table 2. Demographic and Clinical Characteristics of subjects with and without OCPD symptoms (endorsement of at least 4 of 8 diagnostic criteria).

Data are displayed as mean (standard deviation) or number, n, of cases [% of group].

	Controls (N=377)	OCPD symptom group (N=946)	F	Uncorrected P	Corrected Sig
Age, years	28.5 (13.0)	26.2 (11.1)	10.377	0.001	*
Sex male, n [%]	163 [43.2%]	344 [36.4%]	@	0.0241	n.s.
Ethnicity White, n [%]	259 [68.7%]	670 [70.8%]	@	0.464	n.s.
Educational Level	1.44 (1.90)	1.03 (1.70)	14.573	<0.001	**
Generalized Anxiety Disorder, n [%]	30 [8.0%]	208 [22.0%]	@	<0.0001	**
Social Anxiety Disorder, n [%]	24 [6.4%]	146 [15.4%]	@	<0.0001	**
Avoidant Personality Disorder, n [%]	119 [31.6%]	495 [52.3%]	@	<0.0001	**
OCD, n [%]	22 [5.8%]	125 [13.2%]	16.063	<0.001	**
Internet Addiction symptoms, IAT total score	29.0 (9.6)	32.6 (11.8)	27.279	<0.001	**
ADHD symptoms, ASRS total score	16.2 (0.39)	19.8 (0.25)	62.951	<0.001	**
BIS Attentional impulsivity	18.9 (5.1)	18.1 (4.8)	7.558	0.006	n.s.
BIS Motor impulsivity	25.9 (6.9)	24.0 (6.8)	22.671	<0.001	**
BIS Non-Planning impulsivity	25.8 (4.8)	23.5 (5.1)	58.590	<0.001	**
Padua Contamination Obsessions and Washing Compulsions	6.8 (6.8)	11.0 (8.4)	72.255	<0.001	**
Padua Dressing/Grooming Compulsions	1.3 (2.0)	2.6 (2.9)	62.004	<0.001	**
Padua Checking Compulsions	7.6 (6.4)	12.7 (8.5)	110.317	<0.001	**
Padua Thought of Harm to Self/Others	3.2 (3.7)	6.0 (5.3)	87.753	<0.001	**
Padua Impulses to Harm Self/Others	2.2 (3.7)	3.7 (5.2)	25.199	<0.001	**

Statistical tests refer to ANOVA F, except where indicated c = chi-square test. IAT = Young’s Internet Addiction Diagnostic Questionnaire; BIS = Barratt Impulsiveness Questionnaire; Padua = obsessive-compulsive questionnaire; ASRS = Adult ADHD Rating Scale.

Corrected sig. refers to whether differences are statistically significant with Bonferroni correction: * <0.05, ** p<0.01, n.s. not significant.