TABLE 1.

Patient characteristics and surgical characteristics

Characteristics	ESP group	Control group	P value
Total (cases)	20	20
Age (years)	51.30 ± 8.00	50.50 ± 7.75	0.691
Height (cm)	163.05 ± 7.21	159.65 ± 5.55	0.157
Weight (Kg)	57.60 ± 9.39	56.60 ± 9.56	0.832
Duration of surgery (min)	63.10 ± 11.72	67.65 ± 13.35	0.306
ALND (yes/no)	13/7	11/9	0.519

Note: Values are expressed as the mean ± standard deviation (SD) or number of patients. Differences in quantitative variables are compared using 2‐sample Student t test, and differences in qualitative variables are compared using the Chi‐square test. ALND: axillary lymph node dissection.