Table 1 Patient demographics with and without the primary outcome (length of stay > 4 days or readmissions due to “medical” morbidity) in the combined test and training dataset
Preoperative characteristics n (%) unless otherwise specified | training set (n:18,013) | test set (n:3913) |
|---|---|---|
Mean age (SD) | 69.0 (62.0–75.0) | 70.0 (62.0–76.0) |
Mean number of reimbursed prescriptionsa (SD) | 2.0 (0.0–3.0) | 2.0 (0.0–3.0) |
Female gender | 755 (64.0) | 12,133 (58.2) |
Hip arthroplasty | 9918 (54.8) | 2260 (57.8) |
Mean weight in kg (SD) | 80.5 (70.0–93.0) | 81.0 (70.0–92.0) |
Mean height in cm (SD) | 170.0 (164.0–177.0) | 170.0 (164.0–177.0) |
Mean body mass index (SD) | 27.5 (24.6–31.2) | 27.5 (24.6–31.1) |
Regular use of walking aid | 552 (46.8) | 4398 (21.5) |
Missing | 29 (2.5) | 359 (1.7) |
Living alone | 5914 (32.9) | 1381 (35.7) |
With others | 11,971 (66.5) | 2469 (63.8) |
Institution | 116 (0.6) | 21 (0.5) |
Missing | 12 (0.6) | 42 (1.1) |
Hemoglobin (SD) | 8.6 (8.1–9.1) | 8.6 (8.1–9.2) |
Missing | 291 (1.5) | 55 (1.4) |
> 2 units of alcohol/day | 1382 (7.7) | 286 (7.4) |
Missing | 57 (0.8) | 36 (0.9) |
Active smoker | 130 (11.0) | 2751 (13.2) |
Missing | 11 (0.9) | 141 (0.7) |
Cardiac disease | 2527 (14.0) | 529 (13.7) |
Missing | 17 (0.6) | 53 (1.4) |
Hypercholesterolemia | 5396 (29.9%) | 1133 (29.3%) |
Missing | 83 (0.5) | 44 (1.2) |
Hypertension | 9030 (51.4) | 1849 (49.5) |
Missing | 546 (3.0) | 179 (4.6) |
Pulmonary disease | 1668 (9.2) | 355 (9.2) |
Missing | 63 (0.4) | 38 (1.0) |
Previous cerebral attack | 1038 (5.8) | 213 (5.6) |
Missing | 157 (1.3) | 77 (2.0) |
Previous VTE | 1331 (7.5) | 283 (7.4) |
Missing | 283 (1.6) | 66 (1.7) |
Malignancy (undefined) | 1469 (8.1) | 134 (3.4) |
Previous radically treated malignancy | 1752 (9.7) | 440 (11.2) |
Missing | 136 (0.8) | 40 (1.0) |
Chronic kidney disease | 266 (1.5) | 57 (1.5) |
Missing | 276 (1.5) | 50 (1.3) |
Family member with VTE | 2235 (14.1) | 430 (12.5) |
Missing | 2189 (12.6) | 479 (12.2) |
Regular snoring | 266 (22.5) | 5522 (26.5) |
Uncertain about snoring | 208 (17.6) | 3781 (18.1) |
Missing | 259 (21.9) | 3309 (15.9) |
Not feeling rested | 7272 (42.4) | 9340 (44.8) |
Uncertain about being rested | 48 (4.1) | 809 (3.9) |
Missing | 105 (8.9) | 1230 (5.9) |
Psychiatric disorder | 1464 (8.4) | 282 (7.6) |
Missing | 580 (3.2) | 182 (4.7) |
Characteristic based on combination of questionnaire and DNDRP | ||
Diabetes | ||
Diet treated diabetesb | 251 (1.4) | 52 (1.3) |
Oral antidiabetics | 1294 (7.2) | 291 (7.5) |
Insulin treated diabetesc | 405 (2.2) | 68 (1.8) |
Missing | 68 (0.4) | 36 (0.9) |