TABLE II.

Dose and change in dose to the parotids in the control and test plans

Variable	Dose		Change in dose (control – test)
	Control	Test
Dose to left parotid
Overall (Gy)
Mean	38.5±5.5	34.9±5.0	3.6±4.8
Range	30.8 to 56.3	26.4 to 42.9	−3.9 to 22.5
Superficial lobe (Gy)
Mean	33.5±5.1	29.1±4.0	4.4±5.1
Range	27.9 to 58.9	21.4 to 40.1	−4.4 to 24.4
V30 (%)
Mean	59.3±15.2	50.4±13.2	8.9±1.4
Range	37.5 to 100	22.4 to 78.1	−28.5 to 55.1
V60 (%)
Mean	11.4±9.0	9.9±8.4	1.0±5.0
Range	0.4 to 30.9	0.06 to 28.0	−8.38 to 14.4
Dose to right parotid
Overall (Gy)
Mean	38.5±5.6	34.5±5.2	3.5±4.3
Range	28.7 to 51.5	23.9 to 43.9	−2.7 to 18.6
Superficial lobe (Gy)
Mean	33.7±5.0	29.7±4.2	4.0±4.8
Range	27.0 to 49.4	20.9 to 39.7	−3.7 to 18.6
V30 (%)
Mean	59.1±16.3	49.1±14.9	10.0±14.5
Range	34.0 to 100	16.1 to 74.5	−22.3 to 52.6
V60 (%)
Mean	9.3±7.8	8.3±8.3	1.0±5.0
Range	−0.1 to 30.4	0.0 to 31.8	−8.4 to 14.4

V₃₀ = percentage of the volume that received 30 Gy or more; V₆₀ = percentage of the volume that received 60 Gy or more.