Summary of the findings of studies assessing risk-predicting scores after spine surgery.
| Study | No. of Patients | Procedure | Outcome |
| Hartin et al, 201318 | 364 | Thoracic or lumbar and fusion | The fusion risk score was a reliable indicator of ICU admission (P < 0.0001), blood loss (P < 0.0001), and operative time (P < 0.0001). |
| Deogaonkar et al, 201819 | 242 | Lumbar and thoracic fusion surgery | The fusion risk score was an effective indicator of ICU admission (P < 0.01), blood loss (P < 0.001) and operative time (P < 0.001). |
| Nahtomi-Shick et al, 200115 | 103 | Spinal decompression without or with fusion and/or instrumentation and other procedures | The ASA score was correlated with age and predictive of length of stay (P = 0.000) and ICU length of stay (P = 0.012). |
| Howe et al, 201120 | 103 | Spinal fusion | The ASA grade was correlated with ICU length of stay (P = 0.011). The ASA grade was also associated with complications (P = 0.030) and discharge to skilled nursing facilities (P = 0.008). The CCI was correlated with complications (P = 0.028) and discharge to skilled nursing facilities (P = 0.039). |
| Kay et al, 20166 | 808 | Laminectomy, with or without fusion | The ASA score was a predictive factor of ICU admission (P = 0.008). |
| Ibrahim et al, 202022 | 101 | Multilevel spinal fusion | Lower ASA and CCI scores were consistent with greater patient-perceived improvement in health. |
| Khechen et al, 201923 | 298 | Single-level minimally invasive transforaminal lumbar interbody fusion | A higher CCI was associated with greater ICU costs (P = 0.002) and higher likelihood of complication (P = 0.005). |
Abbreviations: ASA, American society of Anesthesiologists; CCI, Charlson Comorbidity Index; ICU, intensive care unit.