. 2021 Feb 18;2021:6641425. doi: 10.1155/2021/6641425

Table 3.

Differences between the low- and high-score groups in the variables analyzed.

		RMSSD	p	PNN50	p	SD1	p	SD2	p	LF	p	SUDS	p
Pre-SUDS	Low score	25.8 ± 16.0	0.015			25.8 ± 16.0	0.015
Pre-SUDS	High score	64.1 ± 4.9	0.015			64.1 ± 4.9	0.015
Post-SUDS	Low score											33.2 ± 17.3	0.002
Post-SUDS	High score											77.5 ± 10.9	0.002
LET	Low score	22.05 ± 3.24	0.023	22.05 ± 3.24	0.010	22.05 ± 3.24	0.025	22.05 ± 3.24	0.046	220.05 ± 30.24	0.035
LET	High score	280.53 ± 10.17	0.023	280.53 ± 10.17	0.010	280.53 ± 10.17	0.025	280.53 ± 10.17	0.046	280.53 ± 10.17	0.035
PSS	Low score	250.88 ± 20.97	0.026	250.88 ± 20.97	0.043	250.88 ± 20.97	0.006
PSS	High score	440.2 ± 70.04	0.026	440.2 ± 70.04	0.043	440.2 ± 70.04	0.006
Neuroticism	Low score	130.94 ± 30.03	0.027
Neuroticism	High score	300.92 ± 30.24	0.027

LET: Life Engagement Test; PSS: Perceived Stress Scale; pre-SUDS: subjective measure of stress minutes before the simulation; post-SUDS: subjective measure of stress minutes after the simulation; LF: the low-frequency band in normalized units (low-frequency); PNN50: the number of successive differences of intervals which differ by more than 50 ms expressed as a percentage of the total; RMSSD: the square root of the average of the sum of the squared differences between adjacent normal R-R intervals; SD1: sensitivity of the short-term variability of the nonlinear spectrum of the HRV; SD2: sensitivity of the long-term variability of the nonlinear spectrum of the HRV.