Table 5.

Correlation analysis of factors contributing to patient deaths.

Variable	Follow-up outcomes
	Spearman’s ρ	P-value
Sex	−0.112	0.234
Age (years)	0.196	0.035
SOFA score	0.378	0.000
APACHE II score	0.456	0.000
PNS index	−0.278	0.003
SNS index	0.249	0.007
Stress index	0.167	0.075
Mean RR	−0.299	0.001
SDNN	−0.124	0.186
SDHR	0.006	0.949
RMSSD	−0.153	0.103
DCmod	−0.174	0.063
ACmod	0.185	0.048