. 2013 Apr 23;1(4):599–603. doi: 10.3892/br.2013.97

Table I.

Characteristics of patients and controls.

Characteristics	Patients	Controls	P-value
Mean age (mean ± SD, years)	46.6±11.1	47.2±10.5	0.588
Age (years)
<45	77	112	0.631
≥45	81	130
Gender
Male	111	157	0.264
Female	47	85
T stage^a
T1–T2	51	-
T3–T4	102	-
N stage^a
N0	9	-
N1-N2-N3	144
Metastasis^a
No	140	-
Yes	10	-
Clinical stage^a
I–II	10	-
III–IV	145	-

The sum of certain characteristics does not equal the total number of patients due to unavailable data. SD, standard deviation.