Table 2.

Descriptive statistics for and bivariate correlations between independent and dependent variables.

Variable	Range							Bivariate correlations between the study variables
	n	M	SD	Min	Max	Skew	Kurt	1.	2.	3.	4.	5.	6.	7.	8.	9.
1. Cardiorespiratory fitness class	173	45.34	11.40	21.90	89.40	0.66	0.71	–
Chronic work stress
2. Job Demand Control ratio	162	0.96	0.19	0.54	1.55	0.77	0.46	0.13	–
3. Effort Reward Imbalance ratio	162	0.89	0.25	0.33	2.02	1.03	2.33	-0.03	0.28**	–
Acute work stress (aggregated mean values per workday)
4. Feelings of stress	155	1.70	0.62	1.00	3.86	0.96	0.48	-0.04	0.08	0.28**	–
5. Feelings of anger	155	1.61	0.52	1.00	3.20	0.77	0.04	-0.03	0.21**	0.20*	0.66**	–
6. Positive affect	155	16.50	2.57	5.86	23.00	-0.37	1.33	0.00	-0.12	-0.13	-0.34*	-0.15	–
7. Negative affect	155	7.58	2.38	5.00	15.71	1.13	0.95	0.00	0.13	0.28**	0.74*	0.58**	-0.39**	–
Heart rate variability
8. Night RMSSD	156	45.81	17.32	10.60	98.84	0.85	0.60	0.08	0.13	-0.29**	-0.85	0.08	0.04	-0.05	–
9. 10-min RMSSD	154	34.70	11.05	5.00	75.00	0.24	0.64	0.17*	0.15	-0.02	-0.09	0.01	0.03	-0.03	0.40**	–

RMSSD, Root Mean Squares of Successive N-N Differences.

*p < 0.01; **p < 0.001.