TABLE 2.

The differences of the observed variables in gender, Grade-level and frequency of mobile phones use.

Variables	M ± SD	Preference for solitude	Psychological distress	Mobile phone addiction	Mindfulness
Gender	Male	0.48 ± 0.31	0.95 ± 0.58	2.51 ± 0.59	2.26 ± 0.59
	Female	0.5 ± 0.23	0.84 ± 0.52	2.69 ± 0.56	2.18 ± 0.50
	t	−2.92**	3.15*	−4.71***	2.12*
Grade	Grade1	0.52 ± 0.27	0.85 ± 0.55	2.61 ± 0.53	2.21 ± 0.57
	Grade2	0.51 ± 0.29	1.00 ± 0.57	2.63 ± 0.60	2.23 ± 0.55
	Grade3	0.50 ± 0.23	0.79 ± 0.50	2.61 ± 0.59	2.19 ± 0.50
	F	0.24	12.75***	0.12	0.52
Frequency	10 min	0.52 ± 0.31	0.89 ± 0.56	2.78 ± 0.58	2.16 ± 0.53
	30 min	0.54 ± 0.24	0.87 ± 0.54	2.59 ± 0.54	2.20 ± 0.54
	1 h	0.48 ± 0.24	0.90 ± 0.54	2.49 ± 0.59	2.28 ± 0.56
	F	1.64	0.47	18.37***	3.50*

N = 927. *p< 0.05, **p < 0.01, and ***p < 0.001.