. Author manuscript; available in PMC: 2016 Aug 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2015 May 1;92(5):1053–1059. doi: 10.1016/j.ijrobp.2015.04.039

Table 1. Summary of kappa statistic agreement for RPS target and OAR volumes.

Contoured structure	Kappa agreement

	RPS1	RPS2
GTV	0.84 Almost perfect	0.92 Almost perfect
CTV	0.79 Substantial	0.86 Almost perfect
HR CTV	0.50 Moderate	0.57 Moderate
Bowel bag	0.82 Almost perfect	0.79 Substantial
Small bowel	0.73 Substantial	0.78 Substantial
Colon	0.73 Substantial	0.82 Almost perfect
Stomach	0.77 Substantial	0.83 Almost perfect
Duodenum	0.41 Moderate	0.36 Fair

Abbreviations: bowel bag = contour encompassing the contents of the peritoneal cavity to include small bowel and colon; CTV = clinical target volume; GTV = gross tumor volume; HR CTV = high-risk clinical target volume; OAR = organ at risk; RPS = retroperitoneal sarcoma.

RPS1 is a patient with a right upper-quadrant de-differentiated (DD) liposarcoma (LPS) with a predominant, well-differentiated (WD) component. RPS2 is a patient with a left upper quadrant DD LPS with a minimal WD component.