Table 2. Demographic factors for the whole cohort for the index surgery as well as the demographics specifically for the patients who underwent a revision procedure and those who did not.
| Patient factor | Index surgery—whole cohort (89 patients) | Index surgery only patients (78 patients) | Revision patients (11 patients) | P value |
|---|---|---|---|---|
| Age (years) | 61.6±10.5 | 61.5±11.0 | 61.8±6.1 | 0.906 |
| Sex (% female), n (%) | 58 (65.2) | 51 (65.4) | 7 (63.6) | 0.909 |
| CCI | 0.95±1.23 | 0.99±1.25 | 0.57±0.98 | 0.400 |
| BMI (kg/m2) | 29.2±8.2 | 29.7±8.3 | 25.1±6.3 | 0.113 |
| Prior cervical spine surgery, n (%) | 34 (38.2) | 30 (38.5) | 4 (36.4) | 0.869 |
| Depression, n (%) | 27 (30.3) | 25 (32.1) | 2 (18.2) | 0.349 |
| Diabetes, n (%) | 7 (7.9) | 7 (9.0) | 0 | 0.301 |
| Osteoporosis, n (%) | 13 (14.6) | 11 (14.1) | 2 (18.2) | 0.720 |
| History of smoking, n (%) | 26 (29.2) | 26 (33.3) | 0 | 0.017 |
P values reflect univariate comparison between revision and non-revision patient groups. CCI, Charlson Comorbidity Index; BMI, body mass index.