Table 3.

Results of the multiple regression analysis considering differences in respiratory rate (RespRate-diff), sex and age as determinants of differences between Test and Retest in corrected HRV parameters.

Test–Retest Difference	Parameters of multiple regression analysis
	Determinant	β	p	Multiple R2	F-test	p
corr-SDNN	RespRate-diff	−0.32	0.08	0.09	1.1	0.36
	Sex	0.13	0.48
	Age	0.02	0.93
corr-RMSSD	RespRate-diff	−0.17	0.36	0.05	0.5	0.67
	Sex	0.07	0.72
	Age	0.13	0.47
corr-pNN50	RespRate-diff	−0.16	0.37	0.10	1.2	0.35
	Sex	0.21	0.25
	Age	0.22	0.21
corr-LF	RespRate-diff	−0.32	0.08	0.09	1.1	0.36
	Sex	0.06	0.74
	Age	−0.02	0.89
corr-HF	RespRate-diff	−0.42	< 0.05	0.17	2.2	0.11
	Sex	0.15	0.37
	Age	0.07	0.65
corr-TP	RespRate-diff	−0.42	< 0.05	0.16	2.0	0.13
	Sex	0.14	0.41
	Age	0.01	0.95
corr-nLF	RespRate-diff	−0.09	0.60	0.10	1.1	0.35
	Sex	0.21	0.24
	Age	−0.23	0.19
corr-nHF	RespRate-diff	0.09	0.60	0.10	1.1	0.35
	Sex	−0.21	0.24
	Age	0.23	0.19
corr-LF/HF	RespRate-diff	0.07	0.72	0.06	0.7	0.58
	Sex	−0.13	0.49
	Age	−0.21	0.23

All independent variables (Test-Retest differences in corrected HRV parameters) and determinant (RespRate-diff) presented normal distribution.