Table 3.
Results of the second stage using multinomial logistic regression analysisa
| THA b | TKA c | |||||
|---|---|---|---|---|---|---|
| Outcome of claim | (n = 408) | (n = 437) | ||||
| Variable | RRR d | 95% CI | p-value | RRR d | 95% CI | p-value |
| Treatment injury | ||||||
| Age over 65 | 0.64 | 0.39–1.05 | 0.08 | 0.57 | 0.34–0.94 | 0.03 |
| Male | 1.08 | 0.69–1.69 | 0.7 | 0.74 | 0.41–1.34 | 0.3 |
| Charlson index | 1.10 | 0.84–1.45 | 0.5 | 0.99 | 0.78–1.27 | 1.0 |
| Cemented | 1.25 | 0.73–2.15 | 0.4 | 0.37 | 0.05–2.79 | 0.3 |
| Hybrid | 0.93 | 0.49–1.76 | 0.8 | 0.12 | 0.01–1.26 | 0.08 |
| Previous THA (TKA) | 1.58 | 0.82–3.03 | 0.2 | 2.46 | 1.00–6.07 | 0.05 |
| THA (TKA) before change in law | 1.05 | 0.62–1.80 | 0.9 | 1.39 | 0.76–2.54 | 0.3 |
| Volume 200–300 | 0.97 | 0.58–1.63 | 0.9 | 0.64 | 0.32–1.29 | 0.2 |
| Volume > 300 | 1.03 | 0.39–2.69 | 1.0 | 0.24 | 0.08–0.72 | 0.01 |
| Infection injury | ||||||
| Age over 65 | 1.03 | 0.49–2.18 | 0.9 | 0.96 | 0.54–1.73 | 0.9 |
| Male | 1.83 | 0.96–3.49 | 0.07 | 2.07 | 1.18–3.64 | 0.01 |
| Charlson index | 0.86 | 0.55–1.34 | 0.5 | 0.99 | 0.75–1.30 | 0.9 |
| Cemented | 2.00 | 0.89–4.50 | 0.09 | 0.26 | 0.03–1.97 | 0.2 |
| Hybrid | 1.13 | 0.43–3.02 | 0.8 | 0.39 | 0.04–3.60 | 0.4 |
| Previous THA (TKA) | 1.23 | 0.46–3.27 | 0.7 | 4.02 | 1.70–9.55 | 0.002 |
| THA (TKA) before change in law | 2.02 | 1.00–4.09 | 0.05 | 1.86 | 0.98–3.53 | 0.06 |
| Volume 200–300 | 0.95 | 0.44–2.05 | 0.9 | 1.49 | 0.74–2.99 | 0.3 |
| Volume > 300 | 0.86 | 0.18–4.14 | 0.8 | 0.97 | 0.41–2.32 | 1.0 |
a Explained variable 0 if the patient did not obtain any compensation, 1 if the patient obtained compensation for a treatment injury, 2 if the patient obtained compensation for an infection injury; reference category = 0.
b THA: total hip arthroplasty.
c TKA: total knee arthroplasty.
d RRR: relative risk ratio.