Table 1.
Population Characteristics and Microsurgical Population Characteristics.
| Clinical Variable | All Patients, N = 108 303, Count (Proportion)/Mean (±Standard Deviation) | Microsurgery Subgroup, n = 6148, Count (Proportion)/Mean (±Standard Deviation) |
|---|---|---|
| Sex | ||
| Female | 90 499 (84%) | 5330 (90%) |
| Male | 17 804 (16%) | 618 (10%) |
| Outpatient | ||
| Yes | 77 728 (72%) | 202 (3.3%) |
| Age | 49 (±7) | 51 (±6) |
| BMI | ||
| Underweight (<18.5) | 1803 | 54 |
| Normal (18.5-24.9) | 33 641 | 1426 |
| Overweight (25.0-29.9) | 34 348 | 2222 |
| Obese class I (30.0-34.9) | 21 190 | 1549 |
| Obese class II (35.0-39.9) | 9573 | 619 |
| Obese class III (>40) | 6138 | 248 |
| Missing | 1610 | 30 |
| Diabetes | ||
| Insulin | 3025 (2.8%) | 112 (1.8%) |
| Non-insulin | 5243 (4.8%) | 298 (4.8%) |
| No diabetes | 100 035 (92.4%) | 5738 (93.3%) |
| Smoking | 14 100 (13%) | 633 (10%) |
| Pulmonary history | 3609 (3.3%) | 144 (2.3%) |
| Liver history | 35 (0.033%) | 0 (0%) |
| Cardiac history | 270 (0.25%) | 5 (0.081%) |
| Renal history | 503 (0.46%) | 5 (0.081%) |
| Hypertension | 27 155 (25%) | 1549 (25%) |
| Wound infection | 6478 (6.0%) | 317 (5.2%) |
| Steroid use | 2345 (2.2%) | 113 (1.8%) |
| Weight loss | 361 (0.33%) | 45 (0.73%) |
| Bleeding disorder | 1585 (1.5%) | 55 (0.89%) |
| Transfusion | 258 (0.24%) | 9 (0.15%) |
| Other procedure | 38 570 (36%) | 1682 (27%) |
| Concurrent procedure | 16 075 (15%) | 2634 (43%) |
| Wound class | ||
| I | 94 855 (87.6%) | 5563 (90.5%) |
| II | 6100 (5.6%) | 361 (5.9%) |
| III | 4078 (3.8%) | 128 (2.1%) |
| IV | 3270 (3.0%) | 96 (1.6%) |
| ASA class | ||
| I | 18 859 (17.4%) | 308 (5.01%) |
| II | 61 120 (56.4%) | 3299 (53.7%) |
| III | 25 888 (23.9%) | 2483 (40.4%) |
| IV | 15 454 (1.3%) | 53 (0.9%) |
| V | 13 (0.012%) | 0 (0%) |
| None assigned | 869 (8.024%) | 5 (0.081%) |
| Operative time, hours | 2.553 (±2.210) | 8.025 (±2.954) |
Abbreviation: BMI, body mass index.