TABLE 6.
Event Analysis of Back Injuries Relative to the Base Chance Represented by Muscular Injuriesa
| Event Analysis | Proportionality of hazard | |||||||
|---|---|---|---|---|---|---|---|---|
| Coeff | Exp(Coeff) | SE(Coeff) | z | Pr(>|z|) | ρ | χ2 | Pr(<|ρ|) | |
| Age at injury | –0.133 | 0.875 | 0.053 | –2.531 | 0.011 | 0.073 | 1.760 | 0.185 |
| Nature of injury | ||||||||
| Bony Tissue | –0.581 | 0.559 | 0.181 | –3.219 | 0.001 | –0.105 | 3.280 | 0.070 |
| Fracture | –1.429 | 0.239 | 0.510 | –2.802 | 0.005 | 0.092 | 2.240 | 0.135 |
| Other | –0.181 | 0.834 | 0.177 | –1.021 | 0.307 | 0.130 | 4.900 | 0.027 |
aThe exponent of the coefficient (Exp[Coeff]), if significant, is indicative of the proportional change in hazard due to the variable. For the proportionality of hazard test, rho (ρ) is the correlation coefficient between survival time and the Schonfield residuals. Coeff, coefficient; SE, standard error.