Table 3 Univariate predictors of event-free survival
Variable | Patients (n) | 5-year event-free survival (95% CI, %) | P value |
|---|---|---|---|
Age at diagnosis (years) | |||
 ≤30 | 35 | 70.2 (52.8–83.3) | 0.764 |
 > 30 | 64 | 69.8 (56.3–80.6) | |
Sex | |||
 Male | 37 | 56.3 (39.3–71.9) | 0.024a |
 Female | 62 | 77.8 (64.4–87.1) | |
Tumor site | |||
 Extremities | 49 | 66.9 (51.8–79.1) | 0.522 |
 Non-extremities | 50 | 73.1 (58.0–84.3) | |
Tumor size (cm) | |||
 ≤5 | 25 | 82.8 (61.8–93.5) | 0.345 |
 5<, < 10 | 37 | 71.3 (54.2–83.9) | |
 ≥10 | 37 | 60.1 (41.9–75.9) | |
Previous surgery or trauma at the site of the primary tumor | |||
 Yes | 14 | 77.1 (47.9–92.5) | 0.998 |
 No | 85 | 68.8 (57.4–78.3) | |
Year of diagnosis | |||
 1999–2009 | 61 | 64.9 (51.1–76.6) | 0.372 |
 2010–2018 | 38 | 78.8 (63.0–89.0) |  |
Biopsy | |||
 Core needle biopsy | 70 | 72.9 (60.4–82.6) | 0.190 |
 Open biopsy | 29 | 63.2 (43.7–79.2) | |
Initial treatment | |||
 Local treatment | 60 | 66.8 (53.0–78.2) | 0.509 |
 Observation/medical treatment | 39 | 75.2 (58.6–86.7) | |