Variables

Observation group (n, %)

Adjuvant therapy group (n, %)

χ2

p value

Preoperative CT

No

12

75.0%

57

55.3%

38.71

0.002

Yes

4

25.0%

46

44.7%

Age

<40 years

12

75.0%

34

33.0%

35.51

<0.001

≥40 years

4

25.0%

69

67.0%

Stage

IB1

8

50.0%

39

37.9%

8.58

0.028

IB2

5

31.3%

33

32.0%

IIA

2

12.5%

11

10.7%

IIB

1

6.3%

20

19.4%

Number of risk factors

1

15

93.8%

85

82.5%

7.54

0.023

2

1

6.3%

15

14.6%

≥3

0

0.0%

3

2.9%

Differentiation

Well

3

18.8%

11

10.7%

7.56

0.007

Intermediate

10

62.5%

56

54.4%

Poor

3

18.8%

36

35.0%

Cell type

Squamous

12

75.0%

88

85.4%

8.19

0.017

Glandular

4

25.0%

12

11.7%

Others

0

0.0%

3

2.9%

Tumor size

≤4cm

15

93.8%

55

53.4%

43.15

<0.001

>4cm

1

6.3%

48

46.6%

Stromal invasion

Inner half

8

50.0%

44

42.7%

0.99

0.321

Outer half

8

50.0%

59

57.2%

LVSI

No

14

87.5%

88

85.4%

0.19

0.408

Yes

2

12.5%

15

14.6%