Correlations between patient baseline characteristics and TKR-related costs during the first 6 months after the procedure. In ASES, higher scores indicate more self-efficacy; in the COPE Inventory, higher scores indicate more of the coping behavior; in DASS21, higher scores indicate worse emotional states; in LOT-R, high values imply optimism; in MHLC, higher scores indicate more of a particular belief; and in MOS-SSS, higher scores indicate more frequent availability of support.
| Predictor Variables | Total TKR-related Costs at 6 Mos* | |
|---|---|---|
| r2 | p | |
| Age, yrs | −0.20 | < 0.01 |
| Female | −0.11 | 0.12 |
| Education, less than high school | 0.10 | 0.14 |
| Body mass index | 0.36 | < 0.01 |
| No. comorbidities | 0.09 | 0.18 |
| MOS-SSS overall index | −0.21 | < 0.01 |
| Emotional or informational support | −0.20 | < 0.01 |
| Tangible support | −0.22 | < 0.01 |
| Positive social interaction | −0.22 | < 0.01 |
| Affectionate support | −0.12 | 0.08 |
| DASS21 depression | 0.23 | < 0.01 |
| DASS21 anxiety | 0.31 | < 0.01 |
| DASS21 stress | 0.12 | 0.08 |
| COPE problem-solving coping | −0.05 | > 0.20 |
| COPE dysfunctional coping | 0.11 | 0.10 |
| COPE emotional coping | −0.11 | 0.10 |
| MHLC internal | −0.04 | > 0.20 |
| MHLC powerful others | 0.07 | > 0.20 |
| MHLC chance | 0.14 | 0.04 |
| Self-efficacy, ASES | −0.11 | 0.11 |
| Optimism, LOT-R | −0.17 | 0.01 |
| Patient’s expenses related to knee OA prior to surgery | 0.21 | < 0.01 |
↵* Spearman correlation coefficients and p values are shown for all variables except sex and education, for which point biserial correlation was used. TKR: total knee replacement; ASES: Arthritis Self-Efficacy Scale; DASS21: Depression, Anxiety and Stress Scale 21; LOT-R: Life Orientation Rest-Revised; MHLC: Multidimensional Health Locus of Control; MOS-SSS: Medical Outcome Study–Social Support Scale; OA: osteoarthritis.