Table 3.

Characteristics of patients in BMI, PSA concentration and PSA mass subgroups.

		BMI (kg/m2)			PSA (ng/ml)			PSA mass (μg)
		I	II	III	I	II	III	I	II	III
Age (years)	Mean	62.8	62.2	62.1	63	61.4	62.6	62.8	61.8	62.7
	SD	6.7	5.9	6	5.7	6.9	5.5	5.8	6.5	6.0
	Range	50–76	48–74	49–71	49–74	48–76	52–72	49–74	48–76	52–72
p value (Kruskal-Wallis test)			0.85			0.47			0.71
BMI (kg/m2)	Mean	23.4	27.4	32.6	27.1	28	27.4	26.9	27.8	28.2
	SD	1.4	1.3	2.3	2.9	4.0	3.3	2.9	3.6	4.0
	Range	17.9–24.9	25–29.9	30.1–40.3	20–37.5	17.9–40.3	22.1–35	20–37.5	17.9–40.3	22.1–38
p value (Kruskal-Wallis test)			<0.001			0.32			0.16
Plasma volume (liters)	Mean	3.1	3.2	3.45	3.2	3.3	3.2	3.2	3.2	3.2
	SD	0.13	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
	Range	2.9–3.4	2.8–3.9	2.9–4.1	2.7–3.7	2.8–4.1	2.9–3.7	2.7–3.7	2.8–4.1	2.9–3.9
p value (Kruskal-Wallis test)			<0.001			0.21			0.43
PSA concentration (ng/ml)	Mean	12.8	14.1	14.2	6.4	14.2	31.3	6.1	14.1	32.6
	SD	8.9	11.9	7.7	1.9	2.8	11.6	1.7	3.5	11.9
	Range	2.8–51.8	1.8–61.7	4.2–43.4	1.8–9.8	10–19.8	20.4–61.7	1.8–9.6	9–21.8	18–61.7
p value (Kruskal-Wallis test)			0.28			<0.001			<0.001
Gleason score	Median	5	6	6	5	6	6	5	6	6
p value (Kruskal-Wallis test)			0.38			0.001			0.001
PSA mass (μg)	Mean	56.6	46.2	48.9	20.8	47	101.1	19.7	46.2	106.7
	SD	27.4	39	25.1	6.37	10.3	37.1	5.6	11.3	36.5
	Range	31.9–156.6	6.5–196.6	13.7–129.5	6.5–32.7	30.3–71	64.2–196.6	6.5–29.8	30.3–69.6	70.7–196.6
p value (Kruskal-Wallis test)			0.09			<0.001			<0.001