Table 3.

Cohen’s d index to post hoc contrast between the means scores and the three classes in the roles of cyberbullying.

	Negative reinforcement SRB vs. positive reinforcement SRB	Negative reinforcement SRB vs. non-SRB	Positive reinforcement SRB vs. non-SRB
Victimization	0.45	0.60	n.s.
Aggression	0.44	0.59	n.s.
Aggression-victimization	0.46	0.60	n.s.
Observation	0.35	0.49	n.s.

SRB, school refusal behavior; n.s., non-significant differences.