Table 2.

Differences in heart rate variability metrics between beginners and experts in cerebral angiography.

	BEGINNERS		EXPERTS
	Mean	SD	Mean	SD	P	BH-p
HRV METRICS
Time domain
Mean RR	757.0	126.3	770.5	93.7	0.548	0.613
Median RR	755.8	129.7	768.6	98.2	0.582	0.613
Mean HR	81.5	13.9	78.9	8.8	0.253	0.370
SDNN	56.8	17.7	57.6	19.7	0.838	0.838
RMSSD	31.4	13.2	25.8	13.9	0.039*	0.082
NN50	41.4	36.9	22.8	30.7	0.007*	0.022*
pNN50	10.2	8.4	6.0	8.0	0.012*	0.033*
Frequency domain
VLF%	38.4	16.2	47.3	15.9	0.006*	0.022*
LF%	50.0	15.5	46.0	16.2	0.205	0.337
HF%	11.6	4.9	6.7	4.1	<0.001**	0.001*
LF/HF	5.2	3.2	10.2	7.6	<0.001**	0.001*
LF n.u.	80.3	8.8	86.0	8.9	0.001*	0.005*
HF n.u.	19.7	8.8	14.0	8.9	0.001*	0.005*
VLF abs	1360.0	1655.8	1762.1	1573.8	0.213	0.338
LF abs	1762.6	1509.0	1533.8	1166.1	0.400	0.532
HF abs	400.7	417.2	232.9	257.3	0.019*	0.045*

Table 2 presents the means (± standard deviation, SD) of the respective time and frequency domain HRV metrics and the results from the comparison between the groups in before (p) and after (BH-p) correction for repeated testing within the same dataset. Abbreviations: *, p < 0.005, **, p < 0.001; SD, standard deviation; HRV, heart rate variability; RR, distance between two subsequent R peaks, SDNN, Standard deviation of normal-to-normal RR- intervals; RMSSD, Square root of the mean squared differences between successive RR-intervals; NN50, Number of successive RR-interval pairs that differ more than 50 ms; pNN50, NN50 divided by the total number of RR-intervals; VLF, Very low frequency (0–0.04 Hz); LF, Low frequency (0.04–0.15 Hz); HF, High frequency (0.15–0.4 Hz), VLF, LF and HF powers [%],Relative powers of VLF, LF and HF bands; LF/HF, ratio between HF and LF band power; LF and HF [n.u.], Powers of LF and HF bands in normalized units; VLF, LF, and HF abs., absolute powers of VLF, LF, and HF bands.