Table 1.

Descriptive statistics for the measures used.

	Mean	SD	Skewness	Kurtosis	Minimum	Maximum	Reliability *
Socio-economic status	6.36	1.68	−0.41	−0.28	0	9	0.61
School achievement	6.71	1.76	−0.37	−0.50	3	9.5	**
Personal well-being	7.75	1.86	−1.15	1.80	0	10	**
Self-esteem	30.83	5.56	−0.62	0.31	10	40	0.89
Emotional symptoms	3.44	2.41	0.55	−0.38	0	10	0.75
Conduct problems	1.74	1.55	1.07	1.28	0	8	0.72
Peer problems	1.45	1.59	1.63	3.54	0	10	0.74
Hyperactivity	4.36	2.17	0.07	−0.49	0	10	0.71
Prosocial behaviour	8.56	1.42	−1.16	1.53	2	10	0.78
Depression	16.40	4.49	1.53	3.12	10	40	0.79
Suicide behaviour	0.58	1.12	2.24	4.66	0	5	0.80
School engagement	41.48	6.85	−0.52	1.40	14	56	0.91
Bullying	0.73	1.27	2.13	4.70	0	7	0.83
Cyberbullying	0.20	0.77	6.51	59.93	0	11	0.82

Note. * Mcdonald´s Omega was performed. ** School achievement was measured by 2 items and personal well-being by 1 item.