Impact of Cold Weather on Setup Errors in Radiotherapy

Table 6

M_PTV of CTV to PTV expansion boundary of patients with chest disease in different groups.

Group	n				δ			MPTV
		X	Y	Z	X	Y	Z	X	Y	Z
Cold weather group	26	0.19	0.31	0.35	0.15	0.21	0.18	0.57	0.92	0.99
Usual weather group	112	0.15	0.21	0.18	0.19	0.26	0.23	0.57	0.78	0.68