Morphology, Volume, and Density Characteristics of the Parotid Glands before and after Chemoradiation Therapy in Patients with Head and Neck Tumors

Table 3

Comparison of variation in volume and density between genders (Student t-test).

Variable	Gender	N	Mean	SD	Min	Median	Max	P value
Total volume	Female	4	−3786	3082	−6964	−4297	415	0.001
	Male	45	−13954	11701	−45630	−11932	9845
Right parotid volume	Female	4	−2596	2055	−4910	−2784	92	0.008
	Male	45	−7184	5963	−21744	−7484	6121
Left parotid volume	Female	4	−1316	1249	−2565	−1513	325	<0.001
	Male	45	−6762	6322	−23883	−5179	6033
Right parotid density	Female	4	1.6	8.6	−11.1	4.7	7.93	0.273
	Male	40	8.1	21.2	−45.4	5.9	50.2
Left parotid density	Female	4	9.4	4.6	4.0	9.6	14.33	0.674
	Male	40	7.7	19.6	−48.4	6.9	45.9

N: sample size; SD: standard deviation; min: minimum; max: maximum. Volume (mm³).