Table 2.

Correlations for the main study variables (N = 2090).

Variable	1	2	3	4	5
1. Number of COVID-related exposures	1	−0.015*	0.139**	0.124**	0.245**
2. Home-quarantine duration		1	−0.083**	−0.033	0.038
3. Daytime sleepiness			1	0.358**	0.386**
4. Problematic smartphone use				1	0.352**
5. PTSD					1

Abbreviations: PTSD, Post-traumatic stress disorder.

*p < 0.05; **p < 0.01.