Table 2 PET-CT indices and EC risk stratification

Histopathological grade

G 1

15 (45.5%)

14.64 ± 4.26

7.39 ± 1.97

21.09 ± 9.57

166.97 ± 105.75

G 2&3

18 (54.5%)

19.19 ± 7.3

9.06 ± 3.34

37.53 ± 16.51

348.05 ± 222.83

P-value

0.0414

0.0986

0.0019

0.0071

95% CI

0.188 to 8.912

 − 0.33 to 3.67

6.59 to 26.29

52.975 to 309.185

Myometrial invasion

 < 50%

15 (45.5%)

12.75 ± 2.23

6.52 ± 1.71

19.95 ± 9.86

132.86 ± 84.91

 > 50%

18 (54.5%)

20.77 ± 6.67

9.79 ± 2.89

38.49 ± 15.32

376.48 ± 202.22

P-value

0.0001

0.0006

0.0003

0.0001

95% CI

4.34 to 11.7

1.538 to 5.002

9.172 to 27.908

129.356 to 357.884

LVSI

Negative

15 (45.5%)

14.06 ± 4.28

6.65 ± 1.88

20.64 ± 8.94

139.63 ± 82.05

Positive

18 (54.5%)

19.68 ± 6.95

9.68 ± 2.92

37.91 ± 16.42

370.83 ± 209.69

P-value

0.0104

0.0016

0.0010

0.0004

95% CI

1.416 to 9.824

1.244 to 4.816

7.599 to 26.941

113.708 to 348.692

LNMs

Negative

24 (72.7%)

14.8 ± 4.33

7.22 ± 2.09

24.47 ± 12.37

176.26 ± 97.99

Positive

9 (27.3%)

23.32 ± 7.27

11.19 ± 2.87

44.98 ± 15.15

504.36 ± 209.42

P-value

0.0002

0.0001

0.0004

 < 0.0001

95% CI

4.336 to 12.704

2.123 to 5.817

10.032 to 30.988

219.842 to 436.358

Risk stratification

LR

11 (33.3%)

12.76 ± 2.07

6.61 ± 1.54

18.72 ± 9.46

132.06 ± 91.49

HR

22 (66.7%)

19.3 ± 6.88

9.15 ± 3.08

35.73 ± 15.65

332.58 ± 207.02

P-value

0.0045

0.0154

0.0024

0.0047

95% CI

2.184 to 10.896

0.52 to 4.56

6.499 to 27.521

66.358 to 334.682