Table 1.

Comparison of means of the global and the local setup errors between the old vacuum group and the new vacuum group (mm). G_N, the new vacuum group. G_O, the old vacuum group. G_ROI represent the global setup errors. G_ROI-C_ROI, G_ROI-S_ROI, and G_ROI-A_ROI represent the local setup errors for the supraclavicular area (S_ROI), the ipsilateral chest wall region (C_ROI) and the ipsilateral arm region (A_ROI), respectively

	GROI						GROI-CROI						GROI-SROI						GROI-AROI
Directions	ML		SI		AP		ML		SI		AP		ML		SI		AP		ML		SI		AP
Group	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO
n	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446
Mean	−0.02	0.07	−0.02	−0.14	−0.03	−0.33	0.02	−0.01	0.1	0.1	−0.09	−0.08	0.03	0.06	−0.15	−0.1	0.02	0.02	−0.05	0.17	−0.13	−0.25	−0.03	−0.29
SD	0.24	0.39	0.23	0.51	0.22	0.48	0.15	0.16	0.1	0.14	0.13	0.18	0.14	0.23	0.14	0.28	0.14	0.21	0.49	0.71	0.51	0.97	0.58	1.03
P value	0.00		0.00		0.00		0.00		0.78		0.38		0.01		0.00		0.93		0.00		0.02		0.00
Directions	Pitch		Roll		Yaw		Pitch		Roll		Yaw		Pitch		Roll		Yaw		Pitch		Roll		Yaw
Group	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO	GN	GO
n	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446	500	446
Mean	−0.09	0.47	0.62	−0.1	−0.07	−0.1	0.22	0.28	0.11	0.02	0.09	−0.06	−0.44	−0.34	0.12	0.25	−0.19	−0.39	−0.58	−0.16	0.3	−0.6	0.39	−1.26
SD	1.05	1.55	1.01	1.63	0.84	1.38	0.9	1.08	1.25	1.04	0.8	0.92	1.18	2.06	1.18	1.78	1.26	1.91	3.13	5.35	3.09	8.41	3.08	5.41
P value	0.00		0.00		0.73		0.33		0.24		0.01		0.39		0.17		0.05		0.13		0.03		0.00

The bold P value indicates that this group of comparison is statistically significant.