Table 1.

Parameter variation between positive and negative retropharyngeal lymph nodes

Size and ADC criteria	Result	n	Mean	Standard deviation	t	p-value
Short-axis diameter	Negative	102	3.85	1.52	−11.401	<0.001
	Positive	233	7.62	4.50
Long-axis diameter	Negative	102	5.99	2.40	−10.332	<0.001
	Positive	233	10.61	5.79
Mean ADC	Negative	102	1.24	0.43	10.664	<0.001
	Positive	233	0.77	0.16
Minimum ADC	Negative	96	1.28	0.75	8.208	<0.001
	Positive	233	0.67	0.14

ADC, apparent diffusion coefficient.