Table 2.

Analysis of the correlation between depression and smartphone dependence (N = 25,987).

Variable	1	2	3	4	5	6	7	8
Experience of depression	1
Difficulty tracking the time spent on smartphones	.143*	1
Difficulty concentrating on other things	.140*	.658*	1
Cannot get the information received from a smartphone out of one’s head	.141*	.591*	.622*	1
Having a strong urge to use smartphones	.157*	.645*	.645*	.759*	1
Smartphone-related health concerns	.124*	.393*	.373*	.505*	.473*	1
Smartphone-related family conflicts	.149*	.401*	.390*	.459*	.466*	.498*	1
Problems in social relations due to smartphones	.112*	.274*	.271*	.486*	.404*	.575*	.538*	1
Difficulty in performing tasks	.153*	.573*	.605*	.558*	.584*	.474*	.464*	.419*	1

^*P < .01.