Table 8.

ANCOVA results for mean sound level and workplace on HRV parameters.

		LF	HF	LF/HF	RMSSD	SDNN
R2		0.291	0.232	0.115	0.197	0.194
F		9.257	6.793	2.919	5.533	5.431
P		0.000	0.003	0.064	0.007	0.008
Mean sound level	F	18.450	4.628	0.185	2.050	6.946
	p	< 0.0001*	0.037*	0.669	0.159	0.011*
Workplace	F	0.129	7.063	5.831	7.668	2.511
	p	0.721	0.011*	0.020*	0.008*	0.120
Mean sound level* Workplace	F	Not included	8.689	6.207	7.945	2.784
	p		0.005*	0.016*	0.007*	0.102

R², determination coefficient.

F, Fisher's coefficient.

P, p–value.

*p < 0.05 relation is significant at 0.05 levels.