Table 1.
Patient and Procedure Characteristics With Bivariate Analyses Examining Relationship to 30-Day Reoperation Rate.
| Variable | Patients | Percentage | Reoperation Rate (%) | P |
|---|---|---|---|---|
| N | 22 151 | — | 3.4 | — |
| Age (years) | .4068 | |||
| <65 | 12 595 | 56.9 | 3.2 | |
| 65-79 | 8423 | 38.0 | 3.6 | |
| 80+ | 1133 | 5.1 | 3.4 | |
| Sex | .0802 | |||
| Male | 10 001 | 45.2 | 3.1 | |
| Female | 12 150 | 54.9 | 3.6 | |
| BMI | <.0001 | |||
| Underweight | 153 | 0.7 | 1.3 | |
| Normal weight | 3695 | 16.7 | 2.6 | |
| Overweight | 7266 | 32.8 | 3.0 | |
| Obese, class I | 6065 | 27.4 | 3.0 | |
| Obese, class II | 3098 | 14.0 | 4.5 | |
| Obese, class III | 1830 | 8.3 | 5.7 | |
| Missing | 44 | 0.2 | — | |
| Race | .8442 | |||
| American Indian or Alaska Native | 146 | 0.7 | 3.4 | |
| Asian | 306 | 1.4 | 2.6 | |
| Black or African American | 1668 | 7.5 | 3.7 | |
| Native Hawaiian or Pacific Islander | 70 | 0.3 | 2.9 | |
| White | 18 666 | 84.3 | 3.3 | |
| Missing | 1295 | 5.8 | – | |
| ASA classification | <.0001 | |||
| 1, 2 | 11 202 | 50.6 | 2.63 | |
| 3 | 10 442 | 47.1 | 4.13 | |
| 4, 5 | 472 | 2.1 | 3.81 | |
| Missing | 35 | 0.2 | ||
| Levels fused | .0049 | |||
| Single-level procedure | 13 056 | 58.9 | 3.08 | |
| Multilevel procedure | 9095 | 41.1 | 3.77 | |
| Approach/technique | .3073 | |||
| Posterior/posterolateral technique | 11 251 | 50.8 | 3.55 | |
| Posterior interbody technique | 4929 | 22.3 | 3.16 | |
| Combined technique | 5971 | 27.0 | 3.18 | |
| Year | .6318 | |||
| 2012 | 3757 | 17.0 | 3.22 | |
| 2013 | 4947 | 22.3 | 3.21 | |
| 2014 | 6136 | 27.7 | 3.31 | |
| 2015 | 7311 | 33.0 | 3.58 |
Abbreviations: BMI, body mass index; ASA, American Society of Anesthesiologists.