Table 2 Baseline characteristics for the overall sample
Overall (n = 1,337) | THA (n = 399) | TKA (n = 938) | BMI < 35 (n = 882) | BMI ≥ 35 (n = 455) | |
|---|---|---|---|---|---|
Gender, n (%) | |||||
Female | 849 (63.5) | 229 (57.4) | 620 (66.1) | 518 (58.7) | 331 (72.7) |
Male | 488 (36.5) | 170 (42.6) | 318 (33.9) | 364 (41.3) | 124 (27.3) |
Age, years, mean (SD) | 66.8 (9.89) | 65.3 (11.8) | 67.5 (8.89) | 68.1 (10.1) | 64.3 (9.05) |
Baseline BMI, (kg/m2), mean (SD) | 32.8 (7.12) | 30.5 (6.24) | 33.8 (7.25) | 28.8 (3.98) | 40.5 (5.31) |
Surgery type, n (%) | |||||
THA | 399 (29.8) | 399 (100) | 0 (0) | 309 (35) | 90 (19.8) |
TKA | 938 (70.2) | 0 (0) | 938 (100) | 573 (65) | 365 (80.2) |
Unilateral | 1,316 (98.4) | 396 (99.2) | 920 (98.1) | 874 (99.1) | 442 (97.1) |
Bilateral | 21 (1.6) | 3 (0.8) | 18 (1.9) | 8 (0.9) | 13 (2.9) |
ASA, n (%) | |||||
1 | 52 (3.9) | 19 (4.8) | 33 (3.5) | 46 (5.2) | 6 (1.3) |
2 | 611 (45.7) | 194 (48.6) | 417 (44.5) | 434 (49.2) | 177 (38.9) |
3 | 412 (30.8) | 109 (27.3) | 303 (32.3) | 229 (26.0) | 183 (40.2) |
4 | 8 (0.6) | 2 (0.5) | 6 (0.6) | 4 (0.5) | 4 (0.9) |
Missing | 254 (19.0) | 75 (18.8) | 179 (19.1) | 169 (19.2) | 85 (18.7) |
Comorbidities, n (%) | |||||
Low back pain | 527 (39.4) | 189 (47.4) | 338 (36.0) | 328 (37.2) | 199 (43.7) |
Other lower limb joint problem | 500 (37.4) | 169 (42.4) | 331 (35.3) | 319 (36.2) | 181 (39.8) |
Heart disease | 496 (37.1) | 139 (34.9) | 357 (38.1) | 326 (37) | 170 (37.3) |
Hypertension | 857 (64.1) | 224 (56.1) | 633 (67.5) | 519 (58.8) | 338 (74.3) |
Diabetes | 343 (25.7) | 66 (16.5) | 277 (29.5) | 173 (19.6) | 170 (37.4) |
Stomach or GIT condition | 226 (16.9) | 50 (12.5) | 176 (18.8) | 133 (15.1) | 93 (20.4) |
Lung disease | 236 (17.7) | 74 (18.5) | 162 (17.3) | 124 (14.1) | 112 (24.6) |
Renal failure | 100 (7.5) | 31 (7.8) | 69 (7.4) | 67 (7.6) | 33 (7.3) |
Liver disease | 24 (1.8) | 4 (1.0) | 20 (2.1) | 17 (1.9) | 7 (1.5) |
Neurological condition | 75 (5.6) | 26 (6.5) | 49 (5.2) | 50 (5.7) | 25 (5.5) |
Depression | 203 (15.2) | 56 (14.0) | 147 (15.7) | 124 (14.1) | 79 (17.4) |
Baseline HOOS/KOOS, mean (SD) | |||||
Pain | 31.5 (17.0) | 31.1 (17.6) | 31.7 (16.7) | 32.5 (17.3) | 29.3 (16.0) |
Symptoms | 34.7 (18.5) | 33.5 (19.8) | 35.2 (17.9) | 35.5 (18.9) | 33.1 (17.7) |
Activities of daily living | 33.1 (17.6) | 31.4 (18.0) | 33.9 (17.4) | 34.4 (17.6) | 30.5 (17.3) |
Sport/Recreation | 13.5 (19.2) | 16.5 (18.8) | 12.2 (19.3) | 14.4 (18.7) | 11.7 (20.3) |
Quality of Life | 18.6 (16.1) | 19.1 (16.8) | 18.4 (15.7) | 19.4 (16.1) | 17.0 (15.9) |
Total | 33.3 (16.9) | 32.1 (17.6) | 33.9 (16.5) | 34.5 (17.0) | 30.9 (16.5) |
Baseline EQ-VAS, mean (SD) | 57.8 (24.1) | 55.9 (24.1) | 58.7 (24.1) | 58.6 (24.8) | 56.4 (22.8) |
Education, n (%) | |||||
Certificate | 32 (2.4) | 10 (2.5) | 22 (2.3) | 22 (2.5) | 10 (2.2) |
Graduate Degree | 34 (2.5) | 12 (3.0) | 22 (2.3) | 27 (3.1) | 7 (1.5) |
No Formal Schooling | 69 (5.2) | 8 (2.0) | 61 (6.5) | 41 (4.6) | 28 (6.2) |
Post-Graduate Degree | 20 (1.5) | 6 (1.5) | 14 (1.5) | 14 (1.6) | 6 (1.3) |
Unknown | 36 (2.7) | 11 (2.8) | 25 (2.7) | 22 (2.5) | 14 (3.1) |
Year 10 or Equivalent | 741 (55.4) | 239 (59.9) | 502 (53.5) | 487 (55.2) | 254 (55.8) |
Year 12 or Equivalent | 186 (13.9) | 69 (17.3) | 117 (12.5) | 123 (13.9) | 63 (13.8) |
Year 6 or Equivalent | 219 (16.4) | 44 (11.0) | 175 (18.7) | 146 (16.6) | 73 (16.0) |
Preferred language, n (%) | |||||
English | 867 (64.8) | 284 (71.2) | 583 (62.2) | 555 (62.9) | 312 (68.6) |
Other | 470 (35.2) | 115 (28.8) | 355 (37.8) | 327 (37.1) | 143 (31.4) |