Table 2. Comparison of hospitalization and surgical characteristics, according to two different mastectomy techniques: Patey⁶ and Madden⁷.

Groups	Patey n = 225	Madden n = 201
	mean (SD	mean (SD)	p
Length of operation (minutes)	105 (± 29)	102 (± 33)	0.60
Length of hospitalization (days)	2.3 (± 0.9)	2.3 (± 0.8)	0.62
Resected lymph nodes	20.3 (± 7.6)	19.8 (± 8.1)	0.52
Involved lymph nodes	5.2 (± 7.5)	4.3 (± 6.9)	0.20

SD = standard deviation.