A randomized controlled study comparing a vessel sealing system with the conventional technique in axillary lymph node dissection for primary breast cancer

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Table 2 Subgroup analysis regarding the total drainage volume

Variables	Vessel sealing system (BVSS)	Conventional devices (CONV)	P value
Total	365 ± 242	625 ± 447	0.006
Age
<60 years	293 ± 144	612 ± 438	0.02
≧60 years	425 ± 291	637 ± 468	0.146
BMI
<25	304 ± 179	594 ± 415	0.005
≧25	620 ± 317	828 ± 657	0.517
Tumor size
T1, T2	388 ± 330	648 ± 438	0.011
T3, T4	211 ± 107	534 ± 511	0.476
Nodal status
Negative	410 ± 295	774 ± 475	0.175
Positive	341 ± 212	561 ± 430	0.046
Neoadjuvant therapy
Yes	374 ± 310	868 ± 511	0.011
No	361 ± 211	564 ± 419	0.092
Breast surgery
Mastectomy	346 ± 180	505 ± 396	0.265
Breast-conserving therapy	412 ± 321	805 ± 473	0.02
Experience of surgeon
<7 years	530 ± 441	691 ± 558	0.642
≧7 years	341 ± 201	608 ± 427	0.007