Table 3. Numbers and metastatic rates of prophylactic (node negative) repeat surgery central-compartment neck dissection (CCND)

	Right CCND		p-value*
	Paratracheal LNs	Upper paraesophageal LNs
No. of removed LNs	0.72±1.46	1.96±0.87
No. of metastatic LNs	0.62±1.19	0.58±0.44
Metastatic LNs rate	28.6% (4/14)	14.3% (2/14)	0.056†

Mann-Whitney test.
p<0.05 when comparing the preoperative and postoperative values.
LNs: lymph nodes, No.: numbers.