Table 2. Operative details of E-NSM and C-NSM groups.

Characteristics		E-NSM (n = 20)	C-NSM (n = 25)	p-value
ALND		2 (10.0)	4 (16.0)	0.68
Balancing procedure		3 (15.0)	2 (8.0)	0.64
Weight of the removed breast (g)		294.6 ± 116.7	275.1 ± 150.7	0.64
Preparation time for surgery (min)		54.1 ± 11.4	57.9 ± 13.5	0.32
Total operative time (min)		269.1 ± 39.6	235.9 ± 43.8	0.04
	Nipple-sparing mastectomy	149.8 ± 37.7	116.4 ± 28.2	< 0.01
	Reconstruction with an implant	112.0 ± 41.5	110.6 ± 39.4	0.91

Values are presented as mean ± standard deviation or number (%).

E-NSM = endoscopic nipple-sparing mastectomy; C-NSM = conventional nipple-sparing mastectomy; ALND = axillary lymph node dissection.