Incidence trends of most common medical complication among patients with an ECI score of 1 to 5 undergoing primary 1- to 2-level primary lumbar fusion within the Medicare database.
| Medical Complication | Incidence of Medical Complications Based on ECI Score, % | P Value | ||||
| ECI 1 | ECI 2 | ECI 3 | ECI 4 | ECI 5 | ||
| Pneumoniae | 0.13% | 0.25% | 0.24% | 0.31% | 0.22% | <0.0001 |
| Deep vein thromboses | 0.05% | 0.06% | 0.06% | 0.06% | 0.11% | <0.0001 |
| Cerebrovascular accidents | 0.28% | 0.33% | 0.40% | 0.46% | 0.40% | <0.0001 |
| Myocardial infarctions | 0.19% | 0.24% | 0.27% | 0.30% | 0.32% | <0.0001 |
| Total | 0.65% | 0.88% | 0.97% | 1.13% | 1.05% | <0.0001 |
Abbreviation: ECI, Elixhauser Comorbidity Index.