Table 3.

Associations between type of Internet services used and risks of Problematic Internet use (PIU: YDQ^a) score ≥ 5 points

	Total			Males			Females
	Adjusted OR	95% CI	P-value	Adjusted OR	95% CI	P-value	Adjusted OR	95% CI	P-value
Information and news searching
No	Reference			Reference			Reference
Yes	0.646	0.434–0.963	0.032	0.699	0.362–1.352	0.288	0.580	0.350–0.961	0.034
E-mail, chat, and internet telephone
No	Reference			Reference			Reference
Yes	0.468	0.569–1.296	0.468	1.133	0.601–2.135	0.699	0.593	0.343–1.025	0.061
Blog and internet bulletin board
No	Reference			Reference			Reference
Yes	1.703	1.064–2.726	0.027	3.277	1.634–6.573	0.001	1.077	0.538–2.155	0.834
Social networking services
No	Reference			Reference			Reference
Yes	3.164	2.154–4.646	<0.001	2.594	1.337–5.034	0.005	3.006	1.844–4.902	<0.001
Online game
No	Reference			Reference			Reference
Yes	1.704	1.197–2.428	0.003	1.923	1.033–3.580	0.039	2.092	1.292–3.390	0.003
Movie and music
No	Reference			Reference			Reference
Yes	1.780	1.040–3.047	0.035	0.968	0.453–2.065	0.932	3.003	1.360–6.733	0.007
Shopping and auction
No	Reference			Reference			Reference
Yes	1.132	0.732–1.750	0.578	0.968	0.485–1.932	0.927	1.339	0.755–2.375	0.318
Others
No	Reference			Reference			Reference
Yes	0.484	0.717–2.021	0.484	0.284	0.231–1.536	0.284	1.714	0.909–3.232	0.096

^aYDQ: Young's Diagnostic Questionnaire.