Average time to fusion by subject subgroup.
| N | Months to Fusion | P value (time to fusion) | |
|---|---|---|---|
| Overall | 44 | 7.3 | |
| Age: <55 years | 28 | 7.3 | 0.86 |
| Age: >55 years | 16 | 7.2 | |
| Female | 23 | 7.3 | 0.97 |
| Male | 21 | 7.3 | |
| No Tobacco Use | 35 | 7.3 | 0.96 |
| Tobacco Use | 9 | 7.3 | |
| Metabolic Comorbidity | 25 | 7.1 | 0.51 |
| No Metabolic Comorbidity | 19 | 7.6 | |
| No Prior Surgery | 34 | 7.4 | 0.44 |
| Prior Surgery | 10 | 6.8 | |
| Single-level Surgery | 24 | 7.3 | 0.85 |
| Multilevel Surgery | 20 | 7.2 | |
| No Worker's Comp | 18 | 7.4 | 0.84 |
| Worker's Comp | 26 | 7.2 | |
| Standalone ALIF | 11 | 7.4 | 0.86 |
| ALIF + PSF | 33 | 7.3 | |
| BMI <30 | 26 | 7.6 | 0.33 |
| BMI >30 | 18 | 6.9 | |
| Spondylolisthesis | 25 | 7.5 | 0.49 |
| No Spondylolisthesis | 19 | 7 |