Table 1.
Demographics and comorbidities between the arthroscopic and open cohorts
| Variable | Arthroscopy cohort | Open cohort | P-value |
|---|---|---|---|
| Case | 9,288 (82.7) | 1,942 (17.3) | - |
| Sex | <0.001 | ||
| Male | 7,212 (83.3) | 1,618 (77.6) | |
| Female | 2,076 (16.7) | 324 (22.4) | |
| Age (yr) | 0.001 | ||
| <18 | 12 (0.1) | 1 (0.1) | |
| 18–24 | 3,450 (37.1) | 727 (37.4) | |
| 25–34 | 2,960 (31.9) | 690 (35.5) | |
| 35–44 | 1,509 (16.2) | 298 (15.3) | |
| ≥45 | 1,357 (14.6) | 226 (11.6) | |
| Body mass index (kg/m2) | 0.772 | ||
| Underweight | 60 (0.7) | 13 (0.7) | |
| Normal weight | 2,949 (32.1) | 631 (32.8) | |
| Overweight | 3,781 (41.2) | 794 (41.3) | |
| Obese, Class I | 1,578 (17.2) | 333 (17.3) | |
| Obese, Class II | 516 (5.6) | 97 (5.0) | |
| Obese, Class III | 300 (3.3) | 53 (2.8) | |
| Comorbidity | |||
| Hypertension | 820 (8.8) | 151 (7.8) | 0.133 |
| Current smoker | 1,876 (20.2) | 505 (26.0) | <0.001 |
| Diabetes | 284 (3.1) | 32 (1.6) | 0.001 |
| Bleeding disorder | 13 (0.2) | 2 (0.1) | 0.772 |
| Steroid use | 61 (0.7) | 10 (0.5) | 0.473 |
| Chronic obstructive pulmonary disease | 46 (0.5) | 8 (0.4) | 0.629 |
| Congestive heart failure | 5 (0.1) | 0 | 0.306 |
| ASA classification | 0.631 | ||
| Class I | 4,260 (45.9) | 881 (45.4) | |
| Class II | 4,400 (47.4) | 919 (47.3) | |
| Class III | 601 (6.5) | 139 (7.2) | |
| Class IV | 22 (0.2) | 3 (0.2) |
Values are presented as number (%).
ASA: American Society of Anesthesiologists.