Table 2.

Comparison of infection stress indexes between the two groups.

Variable	POP	POD-7	POD-14
PCT (μg/L)
Control group	6.62 ± 1.33	2.21 ± 0.31	1.55 ± 0.23
Observation group	6.79 ± 1.26	2.01 ± 0.21*	1.39 ± 0.19*
Mean difference	6.71 ± 1.29	2.11 ± 0.26	1.47 ± 0.21
t	0.117	1.883	3.780
p	0.611	<0.01	<0.01
β-EP (ng/L)
Control group	71.55 ± 5.33	52.31 ± 4.69	46.37 ± 4.44
Observation group	71.32 ± 5.16	50.12 ± 4.71*	39.77 ± 4.16*
Mean difference	71.44 ± 5.25	51.22 ± 4.70	43.07 ± 4.30
t	0.073	7.61	9.19
p	0.761	<0.01	<0.01
CRP (ng/L)
Control group	6.62 ± 1.33	2.21 ± 0.31	1.55 ± 0.23
Observation group	6.79 ± 1.26	2.01 ± 0.21*	1.39 ± 0.19*
Mean difference	6.71 ± 1.29	2.11 ± 0.26	1.47 ± 0.21
t	0.065	11.66	13.11
p	0.854	<0.01	<0.01

POP, pre-operation; POD, postoperative day; PCT, procalcitonin; β-EP, β-endorphin; CRP, C-reactive protein; t, t-test compared to the observation group; ^*p < 0.01, compared with the observation group.