Table 3.

Comparison of the scores in the evaluation of nightmares depending on students’ gender.

		Gender
M (SD)	Total (855)	Male (378, 44.3%)	Female (476, 55.7%)	t	p	Cohen’s d
Nightmare frequency *	3.50 (1.60)	2.98 (1.58)	3.91 (1.50)	8.692	< 0.001	0.60
Nightmare tendency **	36.99 (12.95)	32.26 (11.87)	40.77 (12.55)	10.023	< 0.001	0.70
Item 5h PSQI ***	0.70 (0.79)	0.45 (0.66)	0.89 (0.82)	8.578	< 0.001	0.59

* Nightmare frequency scale [45]. ** Nightmare tendency scale [48]. *** Frequency of “having nightmares or bad dreams in the last month” from the PSQI questionnaire PSQI [43].