Table 1.

Characteristics of the patients in the study groups

Age (years)	Group A	Group B
Mean	52.40	58.38
SE	2.32	2.26
SD	13.75	12.18
P = 0.070: Student's t-test; P = 0.204: Mann-Whitney's non-parametric test
Tumor size (cm)
Mean	3.36	3.26
SE	0.21	0.22
SD	1.25	1.19
P = 0.746: Student's t-test; P = 0.833: Mann-Whitney's non-parametric test
Histological grade
	n (%)	n (%)
1	12 (34.29)	8 (27.59)
2	16 (45.71)	11 (37.93)
3	7 (20.00)	10 (34.48)
total	35 (100.00)	29 (100.00)
P = 0.426: Chi-square test

Group A: ER-positive, n = 35; Group B: ER-negative, n = 29

SD: standard derivation; SE: standard error