Table 3.

Patient and tumor characteristics affecting mean quantitative interfraction shifts by setup method.

Outcome	Factor	Interaction driver and effect on deltas
Vertical Shift	BMI	P = 0.034 BMI impacts kV/kV method more than SGRT; increasing BMI leads to increasing vertical shift detected with kV/kV method
	AGE	P = 0.035 Age impacts kV/kV method more than SGRT; increasing age leads to increasing vertical shift detected with kV/kV method
Roll	Location	P = 0.065 Having a nonlung target location impacts SGRT more than kV/kV method.
	BMI	P = 0.022 BMI impacts kV/kV method more than SGRT; increasing BMI leads to decreasing roll detected with kV/kV method
Rotation	ROM	P = 0.057 4D ROM impacts kV/kV method more than SGRT; increasing ROM leads to increasing rotation detected with kV/kV method

BMI, body mass index; SGRT, Surface‐guided radiation therapy.