Table 2.

Descriptive statistics and correlations between variables.

Variable	M ± SD	1	2	3	4	5	6
1. Gender	1.510 ± 0.500	–
2. Grade	3.600 ± 1.478	0.081*	–
3. Bullying victimization	1.135 ± 0.305	−0.123**	−0.029	–
4. Rumination	42.449 ± 12.008	0.085*	0.144***	0.201***	–
5. Friendship quality	64.009 ± 12.300	0.103**	0.054	−0.198***	−0.154***	–
6. Non-suicidal self-injury	13.562 ± 3.779	−0.026	−0.083*	0.215***	0.394***	−0.124**	–

n = 692; M, mean; SD, standard deviation; *p < 0.05, **p < 0.01, ***p < 0.001.