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Table 2 Definitions and distributions of the eight quantitative volumetric, kinetic, and clinical variables used in this investigation

From: Sex-specific impact of patterns of imageable tumor growth on survival of primary glioblastoma patients

Variable used for Investigation

Definition

Male

Female

Mean

Median

Range

Mean

Median

Range

Age

(years)

Age of patient on date of diagnosis

57.58

58

12–95

58.41

60.5

9–96

T1Gd Radius

(mm)

Combined volume of the central non-enhancing necrotic region and surrounding enhanced region of tumor in a pre-tx T1Gd MR image (converted to a spherically- equivalent radius)

19.52

20.10

3.04–33.61

19.27

18.99

4.61–35.08

Necrosis Radius (mm)

Volume of non-enhancing central necrotic region in a pre-tx T1Gd MR image (converted to a spherically- equivalent radius)

11.39

11.69

0.00–26.54

11.37

11.33

0.00–27.06

Contrast- enhancing (CE) thickness (mm)

Average linear thickness of the contrast-enhancing region in a pre-tx T1Gd MR image (calculated as the difference between the T1Gd radius and the necrosis radius)

8.16

7.85

2.55–18.94

7.89

7.59

0.32–23.26

T2 /FLAIR radius (mm)

Volume of the pre-tx T2 or T2-FLAIR MR image (converted to a spherically- equivalent radius)

27.11

28.31

9.94–39.55

26.98

27.86

9.99–42.81

PIHNA D (mm2/year)

Net tumor cell diffuse invasion rate

32.34

28.99

1.45–145.3

36.25

23.03

0.37–289.9

PIHNA ϱ (year −1)

Net tumor cell proliferation rate

65.88

18.25

1.83–1825

82.40

18.25

1.83–1825

PI D/ϱ (mm2)

Relative tumor invasiveness

2.19

1.65

0.0034–10.26

2.12

1.28

0.0034–10.70