Table 1 Subject characteristics and osteosarcoma progressivity variable.

Age (years)^a

15.5 (5–47)

16 (5–65)

0.641*

Gender^b

 Male

35 (60.3%)

12 (46.2%)

1.775 (0.69–4.52)

0.226†

 Female

23 (39.7%)

14 (53.8%)

Symptoms duration (months)^a

5 (1–24)

4.5 (1–18)

0.682*

Tumor sizes (cm)^a

3.18 (0.16–16.24)

1.91 (0.64–29.30)

0.423*

Tumor locations^b

 Near the knee joint

45 (77.6%)

21 (80.8%)

1.182

0.742†

 Far from the knee joint

13 (22.4%)

5 (19.2%)

(0.472–2.614)

Laboratory results^b

 Increased

45 (77.6%)

15 (57.7%)

3.057

0.026†

 Not increased

13 (22.4%)

11 (42.3%)

(1.105–6.853)

Types of surgery^b

 Amputation

31(53.4%)

9 (34.6%)

1.461

0.110†

 LSS

27 (46.6%)

17 (65.4%)

(0.177–1.203)