Table 13.

Results of internal consistency reliability analysis for the scale (Cronbach’s α).

Scale type	Time point	Cronbach’s α	95% confidence interval	Number of entries	Calibrated α
Addiction Inventory (EAI)	Before measurement	0.786	[0.754, 0.815]	6	0.762–0.798
	After test	0.763	[0.729, 0.794]	6	0.738–0.775
Grit Scale (Grit-O)	Before measurement	0.824	[0.801, 0.845]	12	0.811–0.836
	After test	0.817	[0.793, 0.838]	12	0.803–0.829

An alpha coefficient > 0.7 indicates good internal consistency of the scale.