Table 2. Factors related to fair/poor MacNab score.
| Univariable analysis | Multivariable analysis | |||
|---|---|---|---|---|
| Variable | Rate of fair/poor MacNab score | P | Hazard ratio | P |
| Age | 0.078 | |||
| < = 60 y/o | 4.9% | |||
| >60 y/o | 9.1% | |||
| Sex | 0.300 | |||
| Male | 5.1% | |||
| Female | 7.4% | |||
| Surgical time | 0.154 | |||
| < = 1hr | 4.6% | |||
| >1hr | 7.6% | |||
| BMI | 0.442 | |||
| <27 | 6.5% | |||
| >27 | 4.8% | |||
| Surgical methods | 0.127 | |||
| Transforaminal | 7.2% | |||
| Interlaminar | 4.0% | |||
| Disc herniation type | <0.001 | <0.001 | ||
| Prolapse | 22.2% | 1 | ||
| Extrusion | 4.0% | 0.129 (0.047–0.358) | ||
| Sequestration | 5.8% | 0.193 (0.053–0.509) | ||
| Extension of herniation | 0.236 | |||
| Central | 7.5% | |||
| Subarticular | 3.1% | |||
| Foraminal | 5.0% | |||
| Extraforaminal | 9.4% | |||
| >50% canal compromised | 0.164 | |||
| No | 5.2% | |||
| Yes | 9.2% | |||
| Disc degenerative grade | 0.030 | |||
| 2 | 2.1% | 1 | ||
| 3 | 7.1% | 0.047 | 4.161 (1.176–14.721) | |
| 4 | 13.3% | 12.029 (1.672–86.567) | ||
| Smoking | 0.167 | |||
| No | 5.8% | |||
| Yes | 6.9% | |||
| Alcohol | 0.113 | |||
| No | 5.5% | |||
| Yes | 11.4% | |||
| Surgical level | 0.026 | 0.046 | ||
| L4-S1 | 5.0% | 1 | ||
| L1-L4 | 11.4% | 2.516 (1.108–6.216) | ||
| Symptom duration | <0.001 | 0.118 | ||
| < = 1 year | 5.2% | 1 | ||
| >1 year | 13.7% | 2.277 (0.811–6.391) | ||
| Pre-op ODI | 0.234 | |||
| < = 30 | 5.1% | |||
| >30 | 7.7% | |||
| Pre-op VAS | 0.397 | |||
| < = 6 | 7.1% | |||
| >6 | 5.3% | |||
| Year of surgery** | 0.020 | |||
| < = 2016 | 7.4% | |||
| >2017 | 2.1% | |||
*only included patient who underwent transforaminal approach so year of surgery was not included in the final multivariable analysis.