Table 2 Baseline Patient Characteristics
Variables | Training set (n = 1206) | Test set (n = 302) | P-value |
|---|---|---|---|
Age | 62.8 (12.1) | 63.2 (11.8) | 0.623 |
Sex (Female) | 841 (69.7%) | 211 (69.9%) | 0.964 |
BMI | 25.9 (4.8) | 25.3 (4.3) | 0.075 |
BMI (categorical) | Â | Â | 0.488 |
  < 18.5 | 39 (3.2%) | 14 (4.6%) | – |
 18.5–29.9 | 982 (81.4%) | 241 (79.8%) | – |
  ≥ 30 | 185 (15.3%) | 47 (15.6%) | – |
Comorbidities | |||
 Number of comorbidities | 1.0 (1.1) | 0.9 (1.1) | 0.417 |
 Diabetes | 133 (11.0%) | 30 (9.9%) | 0.584 |
 Hypertension | 518 (43.0%) | 115 (38.1%) | 0.125 |
 High cholesterol | 389 (32.3%) | 93 (30.8%) | 0.626 |
 IHD | 52 (4.3%) | 16 (5.3%) | 0.460 |
 Stroke | 17 (1.4%) | 7 (2.3%) | 0.259 |
 Renal disease | 22 (1.8%) | 7 (2.3%) | 0.576 |
 Back pain | 35 (2.9%) | 7 (2.3%) | 0.581 |
 Depression | 7 (0.6%) | 2 (0.6%) | 0.999 |
Surgical History | |||
 Previous knee surgery | 133 (11.0%) | 37 (12.3%) | 0.548 |
 Previous hip surgery | 236 (19.6%) | 64 (21.2%) | 0.527 |
 Previous lumbar spine surgery | 69 (5.7%) | 28 (9.3%) | 0.025* |
Preop PROMs | |||
 SF-36 PCS | 27.4 (8.9) | 26.7 (9.8) | 0.233 |
 SF-36 MCS | 49.1 (12.1) | 49.2 (12.2) | 0.899 |
 WOMAC | 49.5 (20.9) | 48.5 (20.9) | 0.473 |
 OHS | 40.0 (9.2) | 40.8 (9.3) | 0.190 |
2-year PROM Improvement | |||
 SF-36 PCS | + 20.2 (12.0) | + 19.8 (12.4) | 0.601 |
 SF-36 MCS | + 6.9 (12.1) | + 6.7 (12.6) | 0.804 |
 WOMAC | + 41.4 (20.9) | + 41.6 (22.1) | 0.921 |
 OHS | −24.1 (9.7) | −24.4 (10.2) | 0.658 |
2-year Satisfaction | |||
 Satisfied | 69 (5.7%) | 17 (5.6%) | 0.951 |