Table 1.

Basic characteristics of participants in the test sample and validation sample

Variable	n	Range	Mean	SD
Test sample
Age, years		16–26	19.57	1.56
TA (S-TAI score)	666	23–64	39.89	7.89
IA (IUS score)	446	48–164	101.01	19.46
Stressful life events (ASLEC score)	444	3–83	40.56	14.79
Validation sample
Age, years		17–27	19.89	2.26
TA1 (S-TAI score T1)	551	13–79	39.89	8.53
TA2 (S-TAI score T2)	207	20–67	40.16	9.06
IA1 (IAT score T1)	401	0–79	40.23	12.64
IA2 (IAT score T2)	129	0–68	31.86	16.91

Abbreviations: IUS score, score on the Questionnaire of internet addiction tendency among undergraduates; S-TAI score, last 20 items of Spielberger State-TA Inventory representing the level of trait anxiety; ASLEC score, Adolescent Self-Rating Life Events Check-List score; IAT score, Internet Addiction test score; T1, time 1; T2, time 2.