Table 2 Results of univariate analysis

Age (years)

 <60

85.7

.647

69.3

.240

82.7

.201

71.3

.349

 ≥ 60

82.8

80.4

94.4

80.3

Gender

 Male

83.2

.477

70.4

.412

84.0

.365

70.4

.155

 Female

87.7

79.2

92.5

84.1

ECOG score

 0

87.5

.561

80.0

.388

94.9

.218

80.0

.506

 1–2

83.5

70.5

83.4

72.3

Clinical T stage

 T2

77.9

.881

64.9

.951

90.9

.991

64.9

.705

 T3

84.9

73.0

85.8

73.9

 T4

90.9

81.8

90.0

90.9

Clinical N stage

 N (−)

90.5

.208

81.0

.229

94.7

.115

81.0

.301

 N (+)

82.9

70.5

84.0

72.2

Distance from anal verge

 ≤ 2 cm

76.7

.296

67.9

.780

87.9

.199

67.9

.650

 2–5 cm

83.9

70.9

76.7

72.7

 > 5 cm

92.2

78.6

92.6

80.5

Pretreatment CEA

 ≤ 5 ng/ml

86.8

.617

77.6

.162

91.0

.081

78.5

.213

 > 5 ng/ml

79.9

62.8

76.6

65.3

Type of surgery

 LAR

89.5

<.001

75.6

<.001

88.8

<.001

77.1

<.001

 APR

34.3

40.0

57.1

40.0

Patholgic response

 None/Minimal

83.7

.228

62.8

.096

78.2

.073

64.9

.125

 Moderate

80.1

74.9

89.2

75.7

 Near total

95.8

86.2

93.8

86.4

ypT stage

 Tis/T1

92.3

.080

84.6

.036

92.3

.073

84.6

.069

 T2

93.3

83.8

95.6

83.8

 T3

74.8

63.1

76.9

65.4

ypN stage

 N0

87.4

<.001

85.5

<.001

93.4

<.001

86.7

<.001

 N1

85.9

53.2

76.3

55.0

 N2

57.1

36.0

57.1

36.0

Downstage

 Yes

87.2

.120

85.1

<.001

84.3

.213

86.5

<.001

 No

80.6

56.6

87.9

57.8

Lymphatic invasion

 Yes

75.8

.065

45.1

.004

54.7

<.001

45.1

.002

 No

85.6

76.9

91.4

78.5

Vascular invasion

 Yes

71.4

.047

38.1

.026

57.1

.002

38.1

.017

 No

85.1

74.7

87.7

76.2

Perinerual invasion

 Yes

61.0

<.001

32.1

<.001

53.3

<.001

32.1

<.001

 No

88.6

79.5

91.4

81.1

Circumferential resection margin

 ≤ 1.5 mm

59.4

<.001

48.4

<.001

70.7

<.001

48.4

<.001

 > 1.5 mm

91.6

79.3

90.6

81.1

Distal resection margin

 ≤ 7 mm

92.1

.010

73.0

.525

88.3

.116

74.1

.559

 > 7 mm

75.5

73.4

84.3

75.1