Table 5.

Comparison of blood glucose, plasma cortisol and IL-6 levels in the enrolled patients (N = 62)

	SPI group (N = 31)	Control group (N = 31)	P-value
Preoperation
Blood glucose (mmol/L)	5.3 ± 0.5	5.5 ± 0.7	0.308
Plasma cortisol (nmol/L)	98.5 ± 36.5	92.4 ± 41.0	0.537
IL-6 (pg/ml)	2.1 [1.1, 3.2]	2.1 [1.2, 5.1]	0.851
Postoperation
Blood glucose (mmol/L)	6.3 ± 0.8	6.3 ± 0.8	0.988
Plasma cortisol (nmol/L)	127.8 ± 40.5	137.7 ± 51.9	0.404
IL-6 (pg/ml)	6.5 [3.0, 10.2]	7.8 [3.3, 18.6]	0.253#

Normally distributed data are expressed as the means ± SDs, and nonnormally distributed data are expressed as medians [interquartile ranges], as appropriate

Abbreviation: IL-6 Interleukin-6

# The Kolmogorov-Smirnov test was used to detect whether a difference existed between the two groups