Table 4. Reliability analysis.

Factor	Cronbach’s alpha	Number of items
I-type curiosity	0.87	5
D-type curiosity	0.883	5
Grinding in-autonomy	0.924	3
Grinding in-competence	0.888	4
Grinding in-relatedness	0.917	4
Grinding in-positive affect	0.871	6
Overall scale	0.836	27