Table 4.
Results of the multivariable logistic regressions
| Variable | Value | Analysis 1: IDTB use before therapy in in-house patients (n = 621) |
Analysis 2: IDTB use before therapy in all patients (n = 978) |
||||
|---|---|---|---|---|---|---|---|
| OR | 95% CI | p | OR | 95% CI | p | ||
| Place of initial treatment | In-house tertiary referral hospital (reference) | / | / | / | − | − | − |
| In-house all others | / | / | / | 0.73 | 0.44–1.22 | 0.23 | |
| External all others | / | / | / | 0.12 | 0.09–0.18 | <0.01 | |
| External university hospital/specialized center | / | / | / | 0.31 | 0.19–0.52 | <0.01 | |
| Certification (CCC) | No CCC vs. CCC | 5.34 | 3.25–8.77 | <0.01 | / | / | / |
| Year of diagnosis | Till 2013 (reference) | − | − | − | − | − | − |
| 2014–2015 | 2.24 | 1.21–4.16 | 0.01 | 1.13 | 0.72–1.79 | 0.60 | |
| 2016–2017 | 3.56 | 2.10–6.04 | <0.01 | 1.93 | 1.31–2.85 | <0.01 | |
| 2018–2019 | 5.11 | 2.76–9.49 | <0.01 | 2.83 | 1.82–4.40 | <0.01 | |
| Patients in 2018 | ≤25 (reference) | − | − | − | / | / | / |
| 26–100 | 2.05 | 0.71–5.86 | 0.18 | / | / | / | |
| 101–500 | 0.66 | 0.30–1.47 | 0.31 | / | / | / | |
| ≥500 | 0.81 | 0.37–1.77 | 0.81 | / | / | / | |
| Location | Trunk (reference) | − | − | − | − | − | − |
| Limbs | 1.69 | 1.06–2.71 | 0.03 | 1.53 | 1.08–2.16 | 0.02 | |
| Somewhere else | 0.66 | 0.29–1.48 | 0.31 | 0.92 | 0.47–1.80 | 0.81 | |
| Grading | Low grade (reference) | − | − | − | − | − | − |
| High grade | 1.90 | 1.06–3.41 | 0.03 | 1.85 | 1.17–2.90 | 0.01 | |
| Not applicable/unknown | 1.51 | 0.80–2.83 | 0.20 | 1.60 | 0.94–2.72 | 0.08 | |
| Sarcoma type | STS (reference) | Excludeda | Excludeda | Excludeda | − | − | − |
| BS | Excludeda | Excludeda | Excludeda | 2.28 | 1.43–3.63 | <0.01 | |
| GIST | Excludeda | Excludeda | Excludeda | 0.60 | 0.34–1.05 | 0.07 | |
Variables before selection: analysis 1: age, gender, sarcoma type, year of diagnosis, place of tumor, malignancy, grading, T stage, M stage, number of patients treated in 2018, and certification; analysis 2: age, gender, sarcoma type, year of diagnosis, place of tumor, malignancy, grading, T stage, M stage, initial treatment place, and facility type. /, variable was not available for this analysis; −, reference category.
a
For statistical reasons (backward selection, p > 0.1).