Table 2.

Spearman's rank correlation coefficients between gamma passing rates and S_l–h

Metric	2%/2 mm		1%/2 mm		2%/1 mm
	rs	p-value	rs	p-value	rs	p-value
Global gamma passing rates
S0–0.4	0.479	0.002	0.674	<0.001	0.301	0.059
S0.4–0.8	−0.458	0.003	−0.644	<0.001	−0.258	0.108
S0.8–1.2	−0.511	0.001	−0.690	<0.001	−0.338	0.033
S1.2–1.6	−0.489	0.001	−0.698	<0.001	−0.319	0.045
S1.6–2.0	−0.471	0.002	−0.662	<0.001	−0.283	0.076
Mean speed	−0.470	0.002	−0.674	<0.001	−0.283	0.077
SD speed	−0.417	0.007	−0.611	<0.001	−0.220	0.172
Local gamma passing rates
S0–0.4	0.540	<0.001	0.584	<0.001	0.522	0.001
S0.4–0.8	−0.489	0.001	−0.554	<0.001	−0.404	0.010
S0.8–1.2	−0.526	<0.001	−0.559	<0.001	−0.512	0.001
S1.2–1.6	−0.508	0.001	−0.546	<0.001	−0.489	0.001
S1.6–2.0	−0.498	0.001	−0.553	<0.001	−0.491	0.001
Mean speed	−0.536	<0.001	−0.579	<0.001	−0.515	0.001
SD speed	−0.420	0.007	−0.475	0.002	−0.413	0.008

r_s, Spearman's rho; SD, standard deviation; S_l–h, the proportion of number of control points with multileaf collimator speeds ranging from l to h cm s⁻².