Table 4.
Factors Affecting Motor Score Improvement in American Spinal Injury Association Impairment Scale B, C, and D
| 95% Wald confidence interval | Hypothesis test | ||||||
|---|---|---|---|---|---|---|---|
| Parameter | B | Std. error | Lower | Upper | Wald chi-square | df | Sig. |
| Intercept | 0.786 | 6.3278 | −11.616 | 13.189 | 0.015 | 1 | 0.901 |
| Age at injury | −0.142 | 0.0734 | −0.286 | 0.002 | 3.755 | 1 | 0.053 |
| Neurological level | |||||||
| High cervical (C1–C4) | 17.364 | 3.6753 | 10.160 | 24.567 | 22.320 | 1 | 0.000 |
| Low cervical (C5–T1) | 9.459 | 3.5437 | 2.514 | 16.405 | 7.125 | 1 | 0.008 |
| Thoracic (T2–T10) | 7.527 | 6.1510 | −4.529 | 19.583 | 1.497 | 1 | 0.221 |
| Thoracolumbar (T11–L2) | Baseline | - | - | - | - | - | - |
| ISS score | 0.230 | 0.2121 | −0.186 | 0.646 | 1.177 | 1 | 0.278 |
| AIS | |||||||
| B | 6.661 | 3.6831 | −0.558 | 13.879 | 3.271 | 1 | 0.071 |
| C | 22.893 | 3.0928 | 16.831 | 28.954 | 54.788 | 1 | 0.000 |
| D | Baseline | - | - | - | - | 1 | - |
| Time from injury to surgery | |||||||
| ≤24 h | 6.258 | 2.8774 | 0.618 | 11.897 | 4.729 | 1 | 0.030 |
| >24 h | Baseline | - | - | - | - | - | - |
Std. error, standard error; Sig., significance; ISS, Injury Severity Score; AIS, American Spinal Injury Association Impairment Scale.
Multiple linear regression analysis of motor score improvement from baseline to follow-up (dependent variable) with independent variables: age, ISS, injury type, and early (≤24 h) or late (>24 h) surgery for AIS B, C, and D patients. Having a cervical injury and having surgery within 24 h from time of injury were associated with a greater motor score change. Age at injury, ISS score, and injury type were not associated with motor score change.