Table 2.

Differences of addiction scales between before and after intervention

	Before	After	Paired t test		Difference	ANCOVA
	Mean±SD	Mean±SD	t	p	Mean±SD	Z	p
SAPS						2.444	0.120
CBT-MT	32.75±8.619	26.48±10.970	-5.880	<0.001*	6.27±8.726
CBT	33.42±6.487	28.65±7.968	-6.300	<0.001*	4.77±6.386
YIAT						5.137	0.025*
CBT-MT	46.79±13.800	32.16±19.245	-7.373	<0.001*	14.63±16.237
CBT	46.24±14.537	37.61±14.550	-4.124	<0.001*	8.63±17.640

^*p<0.05.

ANCOVA: time use on smartphone use for a week, SSS, PACS as covariates; MT: music therapy, CBT: cognitive behavioral therapy, SD: standard deviation, SAPS: Korean Smartphone Addiction Proneness Scale, YIAT: Young’s Internet Addiction Test