TABLE 1.

Descriptive statistics of the main variables and their correlation analysis.

	M	SD	1	2	3	4
1. PE	19.70	16.07	1
2. SQ	6.30	3.71	−0.06*	1
3. MIN	54.29	12.26	0.12**	−0.24**	1
4. RT	44.50	10.87	−0.10**	0.28**	−0.37**	1

N = 1,006. PE, physical exercise; SQ, sleep quality; MIN, mindfulness; RT, ruminative thinking.

*P < 0.05, **P < 0.01.