Table 3.
Polynomial Regression Model to Explore the Impact of Hours of Therapy on Motor Functional Independence Measure Change for American Spinal Injury Association Impairment Scale A,B,C,D Groups
| Outcome–Motor FIM change | ||||
|---|---|---|---|---|
| Independent variable | Estimate | Std. error | 95% Wald CI | p |
| Intercept | 19.41 | 7.37 | 4.97, 33.86 | 0.008 |
| Age at injury | −0.05 | 0.06 | −0.17, 0.07 | 0.412 |
| Gender | ||||
| Female | 1.34 | 3.08 | −4.71, 7.39 | 0.664 |
| Male (reference) | - | - | - | - |
| ASIA Impairment Scale (AIS) | ||||
| AIS A | −11.11 | 3.61 | −18.19, −4.03 | 0.002 |
| AIS B | −11.62 | 4.54 | −20.51, −2.73 | 0.010 |
| AIS C | 3.41 | 3.59 | −3.62, 10.44 | 0.341 |
| AIS D (reference) | - | - | - | - |
| Neurological level of injury | ||||
| C1–4 | −10.90 | 3.07 | −16.92, −4.88 | <0.0001 |
| C5–8 | −4.53 | 3.12 | −10.64, 1.59 | 0.147 |
| T1–S5 (reference) | - | - | - | - |
| Pressure ulcer | ||||
| Yes | 2.33 | 2.70 | −2.97, 7.64 | 0.388 |
| No (reference) | - | - | - | - |
| Urinary tract infection | ||||
| Yes | 2.18 | 2.53 | −2.78, 7.13 | 0.390 |
| No (reference) | - | - | - | - |
| Pneumonia | ||||
| Yes | −8.67 | 4.39 | −17.27, −0.08 | 0.048 |
| No (reference) | - | - | - | - |
| Rehabilitation onset | −0.04 | 0.02 | −0.09, 0.008 | 0.105 |
| Total hours of therapy - linear | 0.40 | 0.06 | 0.27, 0.53 | <0.0001 |
| Total hours of therapy - quadratic | −0.001 | 0.0002 | −0.002, −0.001 | <0.0001 |
Rehabilitation onset is defined as the days from injury to rehabilitation admission. FIM, Functional Independence Measure; Std. error, standard error; CI, confidence interval; ASIA, American Spinal Injury Association.