Table 1.

Pearson zero-order correlation analyses for the SPAI-I and its five subscales.

	SPAI-I sum score	Time spent	Compulsivity	Daily-life interference	Craving	Sleep interference
Convergent validity
Internet addiction	0.75∗∗	0.64∗∗	0.65∗∗	0.71∗∗	0.63∗∗	0.64∗∗
Concurrent validity
Loneliness	0.34∗∗	0.29∗∗	0.29∗∗	0.33∗∗	0.25∗∗	0.31∗∗
Social anxiety	0.36∗∗	0.33∗∗	0.35∗∗	0.33∗∗	0.31∗∗	0.30∗∗
Depression	0.32∗∗	0.27∗∗	0.30∗∗	0.28∗∗	0.25∗∗	0.29∗∗
Impulsivity (total)	0.43∗∗	0.36∗∗	0.37∗∗	0.38∗∗	0.35∗∗	0.39∗∗
Motor impulsivity	0.34∗∗	0.29∗∗	0.31∗∗	0.32∗∗	0.26∗∗	0.31∗∗
Non-planning impulsivity	0.20∗∗	0.14	0.12	0.18∗∗	0.15∗∗	0.15∗∗
Attentional impulsivity	0.38∗∗	0.34∗∗	0.36∗∗	0.30∗∗	0.34∗∗	0.38∗∗

^∗∗p < 0.001 (critical **P-value after Bonferroni correction: 0.05/48 = 0.001).