Table 3.

Correlation of continuous variables with hemoglobin parameters

		rtHb		stO2
	Values	Correlation coefficient r	P-value	Correlation coefficient r	P-value
A. Clinicopathology
Age
No.	118	0.17	n.s.	−0.25	0.005
Mean, years	59.3
SD	13.1
Tumor size
No.	118	0.28	0.0020	0.20	0.040
Mean, mm	25.7
SD	15.7
Histological grade
No.	81	0.30	0.0080	0.15	n.s.
Mean	5.9
SD	1.4
B. Metabolism
Glycolytic activity (FDG−SUVmax)
No.	70	0.48	<0.0001	0.02	n.s.
Mean	4.9
SD	3.7
C. Prognosis
10-year relapse-free survival
No.	98	−0.22	0.0300	0.14	n.s.
Mean, %	50.5
SD	19.5
10-year overall survival
No.	98	−0.22	0.0300	0.17	n.s.
Mean, %	65.8
SD	20.7

FDG, ¹⁸F-fluoro-deoxy-glucose; n.s., not significant; rtHb, relative total hemoglobin; SD, standard deviation; stO₂, tissue oxygen saturation; SUV, standardized uptake value.