Table 2. Comparison of patient characteristics versus pre-operative RDW.

Variables	Pre-operative RDW	P value
Gender		0.211
Female(n = 44)	16.78 ± 2.51
Male(n = 76)	16.09 ± 3.48
Age (years)		0.022
<60(n = 94)	15.06 ± 1.38
≥60(n = 26)	16.68 ± 3.40
ECOG score		0.023
0(n = 85)	15.33 ± 1.35
≥1(n = 35)	16.76 ± 3.58
ypTumor size (cm)		0.001
≤2(n = 58)	15.33 ± 1.87
>2(n = 62)	17.37 ± 3.81
Histology		0.090
Well-differentiated(n = 75)	15.97 ± 2.29
Poor-differentiated(n = 45)	16.98 ± 4.18
TRG score		0.002
0-1(n = 60)	15.47 ± 1.15
≥2(n = 60)	17.23 ± 4.15
Tumor location		0.275
Low(n = 69)	16.08 ± 2.38
Middle-high(n = 51)	16.72 ± 4.00
Depth of invasion		0.005
T3(n = 45)	15.31 ± 0.93
T4(n = 75)	16.97 ± 3.81
ypN stage		0.132
N0 (n = 62)	15.98 ± 2.56
N≥1 (n = 58)	16.86 ± 3.81
Stage of disease		0.045
II (n=61)	15.54 ± 2.61
III-IV (n=59)	16.99 ± 3.84
Surgical operation		0.073
Mile’s (n=46)	15.68 ± 1.12
Dixon (n=74)	16.75 ± 3.86
Neurological invasion		0.01
Absent (n=90)	15.05 ± 1.39
Present (n=30)	16.78 ± 3.46
Vascular invasion		0.556
Absent (n=78)	16.23 ± 2.41
Present (n=42)	16.59 ± 4.31

TRG score, tumor regression grading score.