Table 1 Baseline characteristics of responders and non-responders to the long-term follow-up
From: Long-term health related quality of life in total knee arthroplasty
Variables | Responders (n = 471) | Non-responders (n = 260) | p-value |
|---|---|---|---|
Age in years: mean (SD) | 69.73 (6.26) | 71.44 (6.69) | 0.001 |
Age categorized: n (%) | < 0.0001 | ||
≤ 65 | 102 (22.67) | 31 (12.35) | |
65–75 | 263 (58.44) | 133 (52.99) | |
≥ 75 | 85 (18.89) | 87 (34.66) | |
Gender: female: n (%) | 355 (75.37) | 196 (75.38) | 0.997 |
BMI: mean (SD) | 30.22 (4.34) | 30.30 (4.57) | 0.816 |
BMI categorized: n (%) | 0.444 | ||
BMI < 25 | 38 (8.78) | 27 (11.49) | |
25 ≤ BMI < 30 | 181 (41.80) | 90 (38.30) | |
30 ≤ BMI < 35 | 159 (36.72) | 80 (34.04) | |
BMI ≥ 35 | 55 (12.60) | 38 (16.17) | |
Having social support: n (%) | 397 (87.83) | 203 (81.20) | 0.017 |
Civil status: n (%) | 0.246 | ||
Married | 290 (62.91) | 142 (56.57) | |
Partner | 25 (5.42) | 10 (3.98) | |
Divorced | 5 (1.08) | 5 (1.99) | |
Widowed | 128 (27.77) | 83 (33.07) | |
Single | 13 (2.82) | 11 (4.38) | |
Current situation: n (%) | 0.044 | ||
I live alone | 70 (15.22) | 51 (20.24) | |
I live accompanied | 378 (82.17) | 189 (75.00) | |
Residence | 0 (0.00) | 2 (0.79) | |
Others | 12 (2.61) | 10 (3.97) | |
Employment situation: n (%) | 0.252 | ||
Active | 9 (1.96) | 3 (1.21) | |
Temporary inability to work | 16 (3.49) | 3 (1.21) | |
Housekeeper | 200 (43.57) | 98 (39.52) | |
Unemployed | 4 (0.87) | 5 (2.02) | |
Retired | 183 (39.87) | 107 (43.15) | |
Early retirement | 42 (9.15) | 27 (10.89) | |
Others | 5 (1.09) | 5 (2.02) | |
Comorbidity: n (%) | |||
Myocardial infarction | 14 (3.14) | 10 (4.05) | 0.531 |
Congestive heart disease | 17 (3.80) | 11 (4.45) | 0.677 |
Hypertension | 243 (54.61) | 141 (57.09) | 0.530 |
Peripheral vascular disease | 62 (13.90) | 27 (10.93) | 0.263 |
Chronic pulmonary disease | 38 (8.52) | 25 (10.12) | 0.483 |
Ulcer disease | 17 (3.81) | 14 (5.67) | 0.258 |
Mild liver disease | 3 (0.67) | 0 (0) | 0.556 |
Moderate or severe chronic kidney disease | 2 (0.45) | 2 (0.81) | 0.619 |
Diabetes | 52 (11.69) | 33 (13.36) | 0.520 |
Cancer Tumour | 6 (1.35) | 8 (3.24) | 0.098 |
Cerebrovascular disease | 13 (2.91) | 10 (4.05) | 0.425 |
Back pain (backache) | 44 (9.87) | 25 (10.12) | 0.914 |
Rheumatologic disease | 38 (8.52) | 21 (8.54) | 0.994 |
Connective tissue disease | 2 (0.45) | 2 (0.81) | 0.619 |
Depression | 36 (8.07) | 34 (13.77) | 0.017 |
Other pathologies: n (%) | |||
Back | 79 (19.13) | 58 (25.22) | 0.071 |
Homolateral hip | 17 (4.17) | 14 (6.17) | 0.262 |
Contraletral hip | 23 (5.62) | 11 (4.85) | 0.676 |
Contralateral knee | 205 (49.52) | 105 (45.85) | 0.373 |
Upper limbs | 20 (4.91) | 16 (7.08) | 0.260 |
OA severity (Ahlbäck scale): n (%) | 0.671 | ||
Mild | 6 (1.79) | 3 (1.72) | |
Moderate | 75 (22.32) | 45 (25.86) | |
Severe | 255 (75.89) | 126 (72.41) | |
Surgical risk (ASA): n (%) | 0.702 | ||
Low (ASA I, II, III) | 426 (99.07) | 231 (98.72) | |
High (ASA IV) | 4 (0.93) | 3 (1.28) | |
Intraoperative complications: n (%) | 8 (1.87) | 2 (0.85) | 0.507 |
Postoperative complications: n (%) | 61 (14.49) | 35 (15.09) | 0.837 |
Readmissions (6 months): n (%) | 62 (14.00) | 43 (17.84) | 0.183 |
Days in hospital: median (IQR) | 12 (10–15) | 11 (9–15) | 0.252 |
Complications from hospital discharge: n (%) | 37 (8.55) | 22 (9.28) | 0.747 |
Rehabilitation from hospital discharge: n (%) | 157 (41.10) | 81 (39.51) | 0.709 |
WOMAC at pre-intervention: mean (SD) | |||
Pain | 55.72 (17.12) | 56.95 (19.46) | 0.398 |
Stiffness | 56.92 (23.95) | 58.51 (25.36) | 0.403 |
Function | 59.76 (16.77) | 63.33 (18.21) | 0.008 |