Table 3 Univariate Cox proportional hazards models for event-free survival

 > 15

0.78

0.25–2.42

0.670

 male

0.61

0.19–1.96

0.407

 2B

1.48

0.48–4.56

0.496

 Tibia

0.74

0.23–2.34

0.605

 Others

0.68

0.07–6.79

0.739

 Fibroblastic

<0.01

N/A

0.998

 Chondroblastic

1.54

0.25–9.30

0.641

 Others

1.54

0.13–18.25

0.734

 Poor

2.97

1.04–8.45

0.041^*

 < 6.2

1.81

0.52–6.28

0.353

 ≥ 4.6

3.76

0.97–14.57

0.055

 ≥ 5.9

3.89

1.49–10.15

0.005^*

 ≥− 39.8%

4.23

1.21–14.78

0.024^*

 ≥− 54.1%

6.39

1.45–28.10

0.014^*