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Table 3 Spearman’s correlations between post-treatment irradiated kidney volume in percent and continuous variables

From: Renal atrophy after stereotactic body radiotherapy for renal cell carcinoma

 

Parameters

Correlation of irradiated kidney

Variables

Median

Range

Correlation coefficient

P value

V5 (%)

73.7

43.3–91.8

−0.44

0.11

V10 (%)

67.3

34.7–82.5

−0.56

0.03*

V15 (%)

62.5

28.8–67.9

−0.68

< .01*

V20 (%)

53.5

24.1–64.6

−0.76

< .01*

V25 (%)

46.8

20.8–61.1

−0.77

< .01*

V30 (%)

41.9

18.3–55.4

−0.71

< .01*

V40 (%)

33.8

14.5–47.5

−0.65

0.01*

V50 (%)

20.7

6.3–42.1

−0.43

0.12

V60 (%)

13.6

0–35.5

−0.19

0.49

Mean irradiated kidney dose (Gy)

27.5

12.9–37.6

−0.66

< .01*

Pre-SBRT irradiated renal volume (cc)

160.4

99.4–295.5

0.07

0.79

GTV (cc)

14.8

3.0–55.6

0.39

0.16

PTV (cc)

79.8

28.1–146.9

−0.03

0.91

Magnitude of overlap between PTV and kidney volume (cc)

19.8

7.9–50.3

−0.56

0.03*

post-treatment contralateral kidney volume in percent (%, n = 12)

99.3

89.4–109.0

0.65

0.02*

Isocenter dose (Gy)

68.8

50.0–76.4

0.07

0.80

Age (years)

75

58–87

0.03

0.89

Creatinine change ratio (peak value/pre-SBRT) (%)

139.5

105.7–190.0

0.32

0.26

  1. Abbreviations: V n percentage volume of the irradiated kidney receiving at least n dose in Gy, *p < .05