Univariate associations with FICB by time from arrival to hip fracture surgery
| Covariate, % | Surgery ≤24 hours | Surgery >24 hours | ||||
| FICB (n=290) | No FICB (n=123) | P value | FICB (n=109) | No FICB (n=34) | P value | |
| Demographics | ||||||
| Age ≥75 years | 62.4% | 69.1% | 0.19 | 59.6% | 55.9% | 0.70 |
| ISS >9 | 28.6% | 32.0% | 0.50 | 24.8% | 26.5% | 0.84 |
| White race | 89.3% | 87.8% | 0.66 | 78.9% | 70.6% | 0.32 |
| Fall cause of injury | 95.9% | 93.5% | 0.31 | 96.3% | 94.1% | 0.63 |
| Comorbidity present | 80.0% | 84.6% | 0.28 | 89.8% | 91.2% | 1.00 |
| Pre-existing cognitive impairment | 7.2% | 11.4% | 0.17 | 23.9% | 20.6% | 0.69 |
| ASA score ≥3 | 67.6% | 73.2% | 0.26 | 72.5% | 76.5% | 0.65 |
| Surgical information | ||||||
| Hip fracture of the head or neck | 48.8% | 59.5% | 0.07 | 65.4% | 78.8% | 0.18 |
| Surgical replacement | 35.9% | 35.8% | 0.98 | 52.8% | 61.8% | 0.37 |
| General anesthesia | 82.1% | 92.7% | 0.005 | 70.6% | 67.7% | 0.74 |
| Hours to surgery, median | 16.3 | 14.4 | 0.03 | 29.2 | 28.4 | 0.30 |
| Hours in surgery, median | 0.9 | 0.7 | 0.27 | 1.0 | 1.1 | 0.33 |
| Unadjusted outcomes | ||||||
| Delirium within 48 hours | 6.2% | 5.7% | 0.84 | 11.0% | 2.9% | 0.30 |
| Preoperative pain, mean | 3.8 | 4.8 | <0.001 | 3.5 | 4.1 | 0.25 |
| Postoperative pain, mean | 3.3 | 2.9 | 0.13 | 2.5 | 3.3 | 0.33 |
| Preoperative OME, median | 25.0 | 27.0 | 0.69 | 39.5 | 51.3 | 0.06 |
| Postoperative OME, median | 37.5 | 30.0 | 0.84 | 35 | 31.8 | 0.80 |
ASA, American Society of Anesthesiology; FICB, fascia iliac compartment block; ISS, injury severity score; OME, oral morphine equivalent.