Demographical data of patients included (n=233)
| Total (n=233) | |
| Age (year)† | 66.0 (8.30) |
| Female, n (%) | 186 (79.8) |
| Ethnicity | |
| Chinese, n (%) | 194 (83.3) |
| Malay, n (%) | 20 (85.8) |
| Indian, n (%) | 16 (6.9) |
| Others, n (%) | 3 (1.3) |
| Education | |
| No education, n (%) | 34 (14.6) |
| Primary, n (%) | 92 (39.5) |
| Secondary and above, n (%) | 107 (45.9) |
| Knee arthroplasty type, n (%) | |
| Total knee replacement | 221 (94.8) |
| Unicompartmental knee replacement | 12 (5.2) |
| KL grading of index knee, n (%) | |
| 2 or below | 11 (4.7) |
| 3 | 94 (40.3) |
| 4 | 119 (51.1) |
| BMI† | 28.3 (4.6) |
| Functional comorbidity score (0–18)† | 1.8 (1.0) |
| WOMAC pain† (0–100) | 41.7 (18.0) |
| WOMAC function† (0–100) | 35.0 (17.9) |
| SF-36† | |
| Physical component score (norm-based) | 32.2 (9.8) |
| Mental component score (norm-based) | 52.2 (10.5) |
| Number of painful body sites* | 1.0 (2.0) |
| PPTarm† | 182 (83.9) |
| Widespread pain, n (%) | 17 (7.3) |
| PainDETECT score, n (%) | |
| Definite (≥19) | 1 (0.4) |
| Possible (13–18) | 10 (4.3) |
| Impossible (<13) | 221 (94.8) |
*Median (IQR).
†Mean (SD).
BMI, body mass index; KL, Kellgren-Lawrence grading; PPTarm, pressure pain threshold taken at volar side of right forearm; SF-36, Medical Outcome Survey Short-form 36; WOMAC, Western Ontario and McMaster University Index.