Table 4.

Passing rates of Δθ = 90° plans using 3%/3, 3%/2, and 2%/2 mm gamma criteria, along with their Friedman test results.

Gamma criteria	Passing rate for VMAT with collimator angles θ1/θ2 (%)					p-value
	280°/10°	300°/30°	315°/45°	330°/60°	350°/80°
3%/3 mm	97.6 ± 0.6	98.3 ± 0.6	98.4 ± 0.5	98.5 ± 0.5	97.6 ± 0.6	< 0.001*
3%/2 mm	95.4 ± 1.0	96.9 ± 1.0	97.1 ± 0.8	97.2 ± 0.8	95.5 ± 1.1	< 0.001*
2%/2 mm	90.4 ± 2.2	92.7 ± 2.1	92.9 ± 1.8	93.1 ± 1.9	90.4 ± 2.2	< 0.001*

*Statistically significant (p < 0.05).