Table 3.

Preoperative serum levels of CXCL8 (pg/ml) in relation to other variables for men who underwent radical prostatectomy and had available information on serum CXCL8 (n = 95)

Total population (n = 95)
Median serum CXCL8, pg/ml (min-max)	9.97 (3.36–155.53)
By C. acnes category	C. acnes + (n = 58)		C. acnes- (n = 37)
Median serum CXCL8, pg/ml (min-max)	10.01 (5.05–130.93)		9.68 (3.36–155.53)		p = 0.658a
Gleason sum	Gleason 6 (n = 36)	Gleason 3 + 4 (n = 41)	Gleason 4 + 3 (n = 15)	Gleason 8+ (n = 3)
Median serum CXCL8, pg/ml (min-max)	10.05 (4–155.53)	9.21 (3.36–83.2)	9.96 (5.95–16.07)	11.16 (9.41–12.14)	p = 0.843a
Positive sugical margins	No (n = 62)		Yes (n = 33)
Median serum CXCL8, pg/ml (min-max)	10.01 (3.36–155.53)		9.41 (4.79–38.16)		p = 0.344a
pT stage	pT2 (n = 86)		pT3 (n = 9)
Median serum CXCL8, pg/ml (min-max)	9.99 (3.36–155.53)		9.41 (6.24–20.53)		p = 0.576a
PSA
By PSA quartile	< 4.6 ng/ml	≥4.6, < 6.4 ng/ml	≥6.4, < 9.0 ng/ml	≥9 ng/ml
Median serum CXCL8, pg/ml (min-max)	9,68 (5,05-130,93)	10,03 (4,79-155,53)	8,93 (4–38,16)	10,65 (3,36-83,2)	p = 0.646a
Non-parametric correlation
Correlation coefficient	0.069				p = 0.505b
Age
By age quartile	< 61.3 years	≥61.3, < 64.7 years	≥64.7, < 67.1 years	≥67.1 years
Median serum CXCL8, pg/ml (min-max)	10,09 (3,36-155,53)	10,09 (3,36-155,53)	9,21 (5,26-83,2)	11,16 (5,4-62,26)
Non-parametric correlation
Correlation coefficient	0.044				p = 0.674b
Prostate volume
By volume quartile	0–26 ml	27–33 ml	34–50 ml	51–138 ml
Median serum CXCL8, pg/ml (min-max)	10.28 (6.24–16.68)	8.89 (3.36–83.2)	10.8 (4–130.93)	9.68 (5.26–155.53)	p = 0.468a
Non-parametric correlation
Correlation coefficient	0.045				p = 0.681b

^ap-value fron Kruskal-Wallis Test/Mann-Whitney U Test; ^bp-value from Spearman correllation