Table 2.

Means and standard deviations (SD) in experimental group (EG) and control group (CG) at both data collection times.

Outcome	Sample	N	M	SD
HSI (t1)	EG	19	4.07	0.60
	CG	22	3.92	0.59
	Total	41	3.99	0.59
HSI (t2)	EG	19	4.57 *	0.25
	CG	22	3.98 *	0.56
	Total	41	4.25	0.53
GSE (t1)	EG	22	3.01	0.32
	CG	22	3.06	0.44
	Total	44	3.04	0.39
GSE (t2)	EG	22	3.27 *	0.29
	CG	22	3.03 *	0.44
	Total	44	3.14	0.39
ECS (t1)	EG	22	3.95	0.52
	CG	22	3.99	0.42
	Total	44	3.97	0.46
ECS (t2)	EG	22	4.61 *	0.38
	CG	22	3.77 *	0.72
	Total	44	4.16	0.72

Note. EG = experimental group (N = 19), CG = control group (N = 22), total (N = 41), HSI = Heidelberg State Inventory [16], GSE = General Self-Efficacy Scale [24], ECS = Experience of Creation Scale, t = time of measurement; * p < 0.01 (group differences of EG and CG at posttest).