Table 1.
Demographic, Clinical and Psychosocial Characteristics by Baseline Willingness to Undergo TKR
| Characteristic | Unwilling (n=215) | Willing (n=589) | p-value |
|---|---|---|---|
| Age, mean (SD) years | 62.86 (10.74) | 62.11 (8.77) | 0.319 |
| Sex, n (%) Male | 66 (30.7) | 225 (38.2) | 0.050 |
| Race, n (%) | <0.001 | ||
| African-American | 111 (51.6) | 180 (30.6) | |
| White | 104 (48.4) | 409 (69.4) | |
| Education, n (%) | <0.001 | ||
| ≤High School or GED | 114 (53.0) | 231(39.2) | |
| Post-Secondary Training, Associates/Bachelors Degree | 80 (37.2) | 247 (41.9) | |
| Graduate Degree | 21 (9.8) | 111 (18.9) | |
| Income, n (%) | <0.001 | ||
| <$10000 | 42 (22.1) | 78 (14.3) | |
| $10000–$1999 | 58 (30.5) | 101 (18.6) | |
| $20000–$29999 | 22 (11.6) | 92 (16.9) | |
| $30000–$39999 | 20 (10.5) | 48 (8.8) | |
| $40000–$49999 | 18 (9.5) | 49 (9.0) | |
| ≥$50000 | 30 (15.8) | 176 (32.4) | |
| Employment Status, n (%) | 0.001 | ||
| Full Time | 39 (18.1) | 172 (29.4) | |
| Part Time | 18 (8.4) | 58 (9.9) | |
| Unemployed | 35 (16.3) | 50 (8.6) | |
| Disabled | 44 (20.5) | 94 (16.1) | |
| Retired | 79 (36.7) | 211 (36.1) | |
| Health Insurance, n (%) | 0.008 | ||
| Medicare/HMO/Private | 167 (84.8) | 508 (92.4) | |
| Medicaid Only | 15 (7.6) | 20 (3.6) | |
| No Insurance | 15 (7.6) | 22 (4.0) | |
| Recruitment Site, n (%) Non-VA | 204 (94.9) | 549 (93.2) | 0.389 |
| Currently Married, n (%) | 58 (27.0) | 255 (43.3) | <0.001 |
| Household Composition, n (%) | 0.001 | ||
| Lives Alone | 103 (48.4) | 211 (35.9) | |
| Lives with Spouse/Significant Other | 67 (31.5) | 271 (46.1) | |
| Lives with child, other relative or non-relative | 43 (20.2) | 106 (18.0) | |
| # Close friends/relatives, mean (SD) | 7.95 (8.90) | 9.86 (12.83) | 0.045 |
| MOS Social Support, mean (SD) | 66.49 (27.54) | 73.84 (24.21) | <0.001 |
| Charlson Comorbidity Scale, mean (SD) | 2.42 (1.79) | 2.34 (1.75) | 0.543 |
| WOMAC Total*, mean (SD) | 52.52 (16.08) | 48.01 (16.76) | 0.001 |
| WOMAC Disability*, mean (SD) | 35.06 (11.69) | 31.98 (11.94) | 0.001 |
| WOMAC Pain*, mean (SD) | 10.80 (3.49) | 9.84 (3.71) | 0.001 |
| WOMAC Stiffness*, mean (SD) | 4.51 (1.56) | 4.22 (1.71) | 0.034 |
| PHQ-9 Depression, mean (SD) | 6.07 (5.08) | 5.31 (5.05) | 0.060 |
| SF-12 Physical Health, mean (SD) | 36.48(10.62) | 37.98(10.67) | 0.081 |
| SF-12 Mental Health, mean (SD) | 50.29(10.63) | 52.12(9.79) | 0.024 |
*
Higher scores indicate greater pain, disability and/or stiffness
MOS=Medical Outcomes Study; PHQ-9=Patient Health Questionnaire; SF-12= MOS 12-Item Short Form Health Survey; WOMAC=Western Ontario McMaster Instrument