Table 2.

SEM Summary Table for Fit Statistics.

Variables	Chi-Square	df	P	CFI	SRMR
IBI	3.047	2	.218	0.870	0.064
SDNN	4.616	2	.099	0.770	0.077
RMSSD	4.432	2	.109	0.752	0.077
LF	2.952	2	.229	0.924	0.062
HF	3.850	2	.146	0.808	0.074
LF/HF	4.538	2	.012	0.792	0.078

Note. SD = Standard Deviation; IBI = Inter-beat Interval; RMSSD = Root Mean Square of the Successive Differences; SDNN = Standard Deviation of Normal to Normal R-R intervals; LF = Low Frequency Power of Heart Rate Variability; HF = High Frequency Power of Heart Rate Variability; LF/HF = Ratio between Low and High Frequency Components of Heart Rate Variability; df = degrees of freedom, CFI = Comparative Fit Index; SRMR = Standardized Root Mean Square Residual.