Table 4. Correlations between body weight or body volume variations and intra-fractional variations.

		ΔRL(mm)	ΔSI(mm)	ΔAP(mm)	Δpitch(°)	Δroll(°)	Δyaw(°)	Δ3D(mm)
Body weight variations	rho	0.020	0.074	0.237	0.164	0.015	0.057	-0.156
	p	0.660	0.105	0.000	0.000	0.743	0.213	0.001
	N	479	0.479	479	479	479	479	479
Body volume variations	rho	-0.043	0.050	0.035	0.135	-0.101	0.106	-0.189
	p	0.284	0.209	0.374	0.001	0.011	0.008	0.000
	N	635	635	635	635	635	635	635

Abbreviations: ΔRL, variation of right-left; ΔSI, variation of superior-inferior; ΔAP, variation of anterior-posterior; Δpitch, variation of pitch; Δroll, variation of roll; Δyaw, variation of yaw; 3D, three dimensional