Table 1. Demographics, patient variables, comorbidities, and surgical indication prior to matching .
| 65-79 years old | 80+ years old | p | |||
| [n = 6,757] | [n = 1,625] | ||||
| Sex | |||||
| Male | 2,827 | 41.80% | 512 | 31.50% | <0.001 |
| Female | 3,930 | 58.20% | 1,113 | 68.50% | |
| BMI (kg/m2) | |||||
| Underweight | 82 | 1.20% | 29 | 1.80% | 0.071 |
| Normal | 1,012 | 15.00% | 396 | 24.40% | <0.001 |
| Overweight | 2,205 | 32.60% | 630 | 38.80% | <0.001 |
| Obese Class I | 1,796 | 26.60% | 393 | 24.20% | 0.048 |
| Obese Class II | 944 | 14.00% | 122 | 7.50% | <0.001 |
| Obese Class III | 718 | 10.60% | 55 | 3.40% | <0.001 |
| Comorbidities | |||||
| Diabetes | 1,359 | 20.10% | 259 | 15.90% | <0.001 |
| Smoking | 486 | 7.20% | 45 | 2.80% | <0.001 |
| COPD | 468 | 6.90% | 142 | 8.70% | 0.012 |
| Congestive Heart Failure | 38 | 0.60% | 20 | 1.20% | 0.004 |
| Hypertension | 4,801 | 71.10% | 1,270 | 78.20% | <0.001 |
| Renal Failure | 5 | 0.10% | 0 | 0.00% | 0.591 |
| Chronic Steroid Use | 342 | 5.10% | 75 | 4.60% | 0.458 |
| Bleeding Disorder | 162 | 2.40% | 72 | 4.40% | <0.001 |
| Transfusion within 48 hours | 12 | 0.20% | 11 | 0.70% | 0.001 |
| Functional Status | |||||
| Independent | 6,591 | 97.50% | 1,538 | 94.60% | <0.001 |
| Non-independent | 166 | 2.50% | 87 | 5.40% | |
| Surgical Indication | |||||
| Fracture | 389 | 5.80% | 189 | 11.60% | <0.001 |
| Osteoarthritis | 3,717 | 55.00% | 785 | 48.30% | <0.001 |
| Other | 2,651 | 39.20% | 651 | 40.10% | 0.54 |
| ASA Class | |||||
| Class 1 (No disturbance) | 71 | 1.10% | 3 | 0.20% | <0.001 |
| Class 2 (Mild disturbance) | 2,704 | 40.00% | 499 | 30.70% | <0.001 |
| Class 3 (Severe disturbance) | 3,788 | 56.10% | 1,050 | 64.60% | <0.001 |
| Class 4+ (Life threatening) | 186 | 2.80% | 70 | 4.30% | 0.001 |