Table 2 Kaplan-Maier estimates of OS by patient characteristics
Factor | Level | Kaplan–Maier estimates (95%CI) | Log-rank p value | HR (95%CI) | |
|---|---|---|---|---|---|
5-year | 10-year | ||||
Gender | F (ref) | 93.8 (84.2–97.6) | 87.0 (74.2–93.7) | 0.583 | 1 |
M | 91.5 (84.7–95.3) | 83.7 (74.8–89.6) | 1.21 (0.61–2.42) | ||
Age | < 30 (ref) | 93.2 (82.9–97.4) | 88.8 (76.4–94.9) | 0.0262 | 1 |
30–50 | 94.2 (86.5–97.5) | 88.1 (78.2–93.7) | 1.53 (0.65–3.62) | ||
> 50 | 86.6 (70.7–94.2) | 70.4 (49.7–83.9) | 3.08 (1.27–7.46) | ||
Histological grade | 1 (ref) | 97.0 (91.0–99.0) | 95.6 (88.6–98.4) | 0.0005 | 1 |
≥ 2 | 86.9 (77.6–92.6) | 73.5 (61.7–82.1) | 3.74 (1.69–8.26) | ||
Axial | No (ref) | 97.0 (88.3–99.2) | 89.9 (82.9–94.1) | 0.226 | 1 |
Yes | 90.0 (77.2–95.8) | 82.3 (73.5–88.4) | 1.41 (0.68–2.91) | ||
Type of surgery | Amputation | 87.5 (38.7–98.1) | 87.5 (38.7–98.1) | 0.3616 | 1.08 (0.14–8.57) |
Complete resection (ref) | 95.8 (87.5–98.6) | 90.2 (79.2–95.5) | 1 | ||
Debulking | 91.5 (78.8–96.7) | 82.4 (66.1–91.4) | 1.56 (0.60–4.06) | ||
Partial resection | 91.2 (78.3–96.6) | 82.2 (65.8–91.3) | 2.10 (0.90–4.89) | ||
Cartilage cap | < 3 cm (ref) | 96.9 (88.1–99.2) | 92.4 (80.7–97.1) | 0.2524 | 1 |
≥ 3 cm | 93.7 (83.9–97.6) | 86.7 (73.6–93.6) | 1.88 (0.63–5.61) | ||
Max. tumor dimension | < 15 (ref) | 93.7 (87.3–97.0) | 88.8 (80.5–93.7) | 0.3423 | 1 |
≥ 15 | 94.4 (79.5–98.6) | 83.7 (64.9–93) | 1.52 (0.64–3.61) | ||