Stepwise multiple linear regression model of the influence of baseline patient characteristics on TKR-related costs. For DASS21 anxiety, higher scores indicate more anxiety, and for MOS-SSS positive social interaction, higher scores indicate more frequent availability of positive social interaction.
| Predictor Variables | Total TKR-related Costs at 6 Mos, Natural Log-transformed | ||
|---|---|---|---|
| B (β) | e(betas) | p | |
| Age, yrs | −0.001 (−0.04) | 0.999 | 0.55 |
| Female | −0.131 (−0.21) | 0.877 | < 0.01 |
| White race | −0.091 (−0.14) | 0.913 | 0.03 |
| Body mass index | 0.010 (0.23) | 1.010 | < 0.01 |
| MOS-SSS positive social interaction, range 1–5 | −0.064 (−0.17) | 0.938 | < 0.01 |
| DASS21 anxiety, range 0–42 | 0.013 (0.22) | 1.013 | < 0.01 |
| Baseline WOMAC function | 0.0001 (0.01) | 1.000 | 0.91 |
| Patient’s costs prior to surgery | 0.041 (0.14) | 1.042 | 0.03 |
| Adjusted R2, total | 0.25 | ||
TKR: total knee replacement; DASS21: Depression, Anxiety and Stress Scale 21; MOS-SSS: Medical Outcome Study–Social Support Scale; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index.