Table 2. The time spent in mediastinal lymph node dissection.

Lymph nodes	Traditional aspirator, mean ± SD (s)	New aspirator, mean ± SD (s)	P
No. 2/4R	544.71±120.80	507.54±100.00	0.008
No. 7R	507.11±104.61	465.09±94.94	0.001
No. 7L	608.47±128.50	549.39±102.11	<0.001

SD, standard deviation; s, seconds.