Table A1.
Sensitivity Analysis of Multivariable Logistic Regression Model of Table 4
| Variable | Missing Patients Coded as Having Died | Missing Patients Coded as Being Alive | ||
|---|---|---|---|---|
| Odds Ratio (95% CI) | P | Odds Ratio (95% CI) | P | |
| Age at surgery (per 5-year increase) | 1.13 (1.04 to 1.22) | .002 | 1.11 (1.00 to 1.23) | .05 |
| First surgery type (odds for emergency) | 0.84 (0.53 to 1.32) | .44 | 1.30 (0.74 to 2.30) | .36 |
| Spinal levels affected (per additional level) | 1.01 (0.94 to 1.08) | .89 | 1.05 (0.97 to 1.14) | .19 |
| Preoperative KPS (per 10-unit decrease) | 1.13 (1.01 to 1.26) | .04 | 1.37 (1.16 to 1.61) | < .001 |
| Preoperative Frankel category | .04 | .65 | ||
| E | Ref | Ref | ||
| D | 1.56 (0.99 to 2.56) | 1.35 (0.70 to 2.62) | ||
| A/B/C | 1.96 (1.14 to 3.37) | 1.33 (0.64 to 2.76) | ||
| ASA | .51 | .65 | ||
| 1 | Ref | Ref | ||
| 2 | 1.13 (0.63 to 2.03) | 1.09 (0.44 to 2.75) | ||
| 3 | 0.85 (0.46 to 1.59) | 1.21 (0.48 to 3.07) | ||
| 4 | 1.27 (0.43 to 3.72) | 2.17 (0.57 to 8.29) | ||
| Complications (odds for complications) | 1.00 (0.68 to 1.45) | .98 | 1.41 (0.85 to 2.33) | .18 |
Abbreviations: ASA, American Society of Anesthesiologists; KPS, Karnofsky performance score; Ref, reference.