Table 4.
Risk factors for the non-improvement of ODI* at postoperative 2 years.
| Univariate | Multivariate | |||||
|---|---|---|---|---|---|---|
| p-value | OR | 95% CI | p-value | OR | 95% CI | |
| Fusion | 0.802 | 1.14 | 0.41, 3.18 | |||
| Female | 0.436 | 0.66 | 0.23, 1.87 | 0.073 | 14.23 | 0.78, 259.89 |
| Age, yrs | 0.759 | 0.99 | 0.93, 1.05 | |||
| Height, cm | 0.299 | 1.03 | 0.97, 1.09 | 0.114 | 1.12 | 0.97, 1.28 |
| Weight, Kg | 0.746 | 1.01 | 0.96, 1.06 | |||
| BMI, Kg/m2 | 0.595 | 0.96 | 0.81, 1.13 | |||
| 2 level surgery | 0.131 | 2.53 | 0.76, 8.46 | 0.081 | 3.73 | 0.85, 16.34 |
| SPL | 0.805 | 0.88 | 0.31, 2.49 | |||
| Preop NRS-B | 0.011 | 0.75 | 0.61, 0.94 | 0.006 | 0.68 | 0.52, 0.89 |
| Preop NRS-L | 0.264 | 0.88 | 0.70, 1.10 | |||
| Preop SVA, mm | 0.377 | 0.99 | 0.98, 1.01 | |||
| Preop LL, ° | 0.922 | 1.00 | 0.97, 1.03 | |||
| Preop PI-LL, ° | 0.156 | 0.97 | 0.94, 1.01 | |||
| Preop PT, ° | 0.165 | 0.96 | 0.91, 1.02 | |||
| Preop PI, ° | 0.095 | 0.95 | 0.90, 1.01 | 0.078 | 0.94 | 0.87, 1.01 |
SPL spondylolisthesis, Preop preoperative, NRS-B numerical rating score of pain on back, NRS-L numerical rating score of pain on leg, SVA sagittal vertical axis, LL lumbar lordosis, PI-LL difference between pelvic incidence and lumbar lordosis, PT pelvic tilt, PI pelvic incidence, OR odds ratio, CI confidence interval.
Nagelkerke R2 statistic = 0.284 and Hosmer and Lemeshow goodness of fit test was not significant at 5% (P = 0.792).
*The minimal clinically important difference of Oswestry disability index was set as 8/5021,22.
Boldface type indicates statistical significance.