Model 2 - Hierarchical logistic regression analysis of Persistent Post-surgical Pain 4–6 months (T3) following TKA and THA on demographic and clinical baseline measures (T1), and post-surgical pain and anxiety 48 h after surgery (T2).

Note. After removing 2 outliers, this final model correctly predicted 75% of all patients; χ2(5) = 27.935 p<0.001; Nagelkerke R2 = 0.372; OR = odds ratio; CI = confidence interval; bold = significant at p≤.05.
1Continuous variable, NRS - Numerical Rating Scale (0–10) from BPI-SF: Brief Pain Inventory-Short Form;
2Continuous variable;
3Dichotomic variable: 0 = THA: Total Hip Arthroplasty; 1 = TKA: Total Knee Arthroplasty;
aContinuous variable, HADS-A: Hospital Anxiety and Depression Scale - anxiety subscale.