Table 2 Univariate analysis of UIROR risk factors
From: Risk factors of unintended return to the operating room in adult spinal deformity
| Parameters | UIROR | Non-UIROR | P |
|---|---|---|---|
| Patient-related | |||
| Age (years) | 34.47±14.95 | 31.48±12.22 | .385 |
| Gender (male/female) | 7/8 | 42/84 | .391 |
| Obesity (obese/none) | 3/12 | 6/120 | .046* |
| Previous spine surgery history (yes/no) | 0/15 | 18/108 | .217 |
| Duration of spinal deformity history (years) | 26.20±15.32 | 18.86±12.62 | .040* |
| Previous neurological symptom (yes/no) | 10/5 | 29/97 | .001* |
| Congenital deformity (yes/no) | 11/4 | 52/74 | .026* |
| Radiographic | |||
| Preoperative Cobb angle of main curve (°) | 91.61±30.34 | 89.62±36.09 | .838 |
| Preoperative flexibility of main curve (%) | 16.20±16.98 | 14.37±14.55 | .652 |
| Preoperative maximum kyphosis angle (°) | 77.56±37.87 | 72.23±43.32 | .649 |
| Preoperative AVR (>II/≤II) | 11/4 | 47/79 | .011* |
| Surgery related | |||
| Total operative time (min) | 317.00±110.01 | 288.65±82.71 | .154 |
| Intraoperative estimated blood loss (ml) | 1060.00±701.83 | 809.92±631.51 | .154 |
| Number of fusion vertebrae | 10.20±3.34 | 10.89±3.36 | .454 |
| ASA (>2/≤2) | 1/14 | 33/93 | .118 |
| Osteotomy (yes/no) | 10/5 | 79/47 | .501 |
| Thoracoplasty (yes/no) | 3/12 | 23/103 | .550 |
| Fusion to sacrum (yes/no) | 3/12 | 8/118 | .096 |