Table 2 Descriptive statistics of study variables for target group at the pre-test and the post-test administration with t-test results and Cohen’s d.

Measures	Pre-test (N = 27)		Post-test (N = 27)		t (26)	Cohen's d
Measures	M	DS	M	DS	t (26)	Cohen's d
RFQ—Certainty about mental states¹	0.65	0.46	0.46	0.50	2.15*	0.41
RFQ—Uncertainty about mental states¹	0.67	0.34	0.78	0.36	− 1.20	− 0.23
TDRS—Death representation as annihilation	2.70	0.70	2.81	0.47	− 0.88	− 0.17
PANAS—Positive Affect	49.26	11.37	47.70	10.08	0.73	0.14
PANAS—Negative Affect	35.41	11.76	37.56	10.40	− 1.03	− 0.20
SDQ—Total Problems	13.96	8.30	14.37	6.65	− 0.39	− 0.07
SS—Attachment security mother	45.96	5.52	46.07	5.52	− 0.11	− 0.02
SS—Attachment security father	43.70	6.84	43.85	8.70	− 0.16	− 0.03
MSCS—Interpersonal Relationships	77.78	9.40	75.51	9.01	2.10*	0.40
MSCS—Competence Environmental Control	72.11	8.02	72.30	9.06	− 0.14	− 0.03
MSCS—Emotionality	72.48	11.13	68.64	10.90	1.89	0.36
MSCS—Scholastic Success	72.69	13.01	69.10	10.29	2.09*	0.40
MSCS—Family Life	83.66	9.78	82.63	9.89	0.55	0.11
MSCS—Body Identity	74.11	9.82	71.49	10.07	1.32	0.25
MSCS—Total self-esteem	452.78	49.76	439.67	42.12	1.62	0.31
DESSA—Total socio-emotional competence	161.15	40.03	169.89	43.99	− 1.43	− 0.27

¹A square root transformation was applied to normalize the distribution of the two RFQ factors.
*p < .05; **p < .01; ***p < .001.

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