Table 4.

Bivariate correlations (N = 107)

Variables	1	2	3	4	5	6	7	8
1. Age	1
2. Sex	0.06	1
3. Alpha K	−0.10	−0.05	1
4. Alpha D	0.07	0.04	−0.68***	1
5. Delta K	0.06	0.05	0.37***	−0.34***	1
6. Delta LF	<0.01	0.05	0.32**	−0.23*	0.84***	1
7. Negative emotion	−0.14	0.19†	0.28**	−0.24*	0.24*	0.14	1
8. Smartphone use disorder	−0.21*	−0.03	0.23*	−0.22*	0.34***	0.26**	0.52***	1

Note: †p < 0.10; *p < 0.05; **p < 0.01; ***p ≤ 0.001.