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Table 2 Mean histogram feature comparison between GTVfailure and GTVresponder, with associated Wilcoxon signed-rank test p values

From: Voxel-based identification of local recurrence sub-regions from pre-treatment PET/CT for locally advanced head and neck cancers

Histogram Features

GTVfailure

GTVresponder

p values

Minimum

2.79 ± 2.23

1.21 ± 0.38

0.031*

Maximum

14.53 ± 5.87

14.93 ± 6.68

0.747

Mean

7.37 ± 3.47

5.40 ± 1.90

0.007*

Variance

11.57 ± 11.28

13.71 ± 14.84

0.459

Skewness

0.13 ± 0.32

0.07 ± 0.10

0.517

Kurtosis

0.46 ± 0.95

0.28 ± 0.51

0.517

  1. GTVfailure: recurrence volume within the primary tumor, GTVresponder: responder volume within the primary tumor
  2. * Significant difference (p ≤ 0.05) between GTVfailure and GTVresponder